From Industry 4.0 Digital Manufacturing to Industry 5.0 Digital Society: a Roadmap Toward Human-Centric, Sustainable, and Resilient Production

The present study addresses two critical controversies surrounding the emerging Industry 5.0 agenda. Firstly, it seeks to elucidate the driving forces behind the accelerated momentum of the Industry 5.0 agenda amidst the ongoing digital industrial transformation. Secondly, it explores how the agenda’s sustainability values can be effectively realised. The study conducted a comprehensive content-centric literature synthesis and identified how Industry 4.0 shortcomings adversely impacted sustainability values. Furthermore, the study implements a novel approach that determines how and in what order the sustainability functions of Industry 4.0 should be leveraged to promote the sustainability objectives of Industry 5.0. Results reveal that Industry 4.0 has benefited economic and environmental sustainability values most at the organisational and supply chain levels. Nonetheless, most micro and meso-social sustainability values have been adversely impacted by Industry 4.0. Similarly, Industry 4.0 has been worryingly detrimental to macro sustainability values like social or economic growth equality. These contradictory implications of Industry 4.0 have pulled the Industry 5.0 agenda. However, the results identified nine sustainability functions of Industry 4.0 that, when leveraged appropriately and in the correct order, can offer important implications for realising the economic and socio-environmental goals of Industry 5.0. For example, under extreme unpredictability of business world uncertainties, the business should first leverage the automation and integration capabilities of Industry 4.0 to gain the necessary cost-saving, resource efficiency, risk management capability, and business antifragility that allow them to introduce sustainable innovation into their business model without jeopardising their survival. Various scenarios for empowering Industry 5.0 sustainability values identified in the present study offer important implications for knowledge and practice.


Introduction
Industry 5.0 has garnered significant attention and generated hype across industries, academia, and policy circles in recent years (Mukherjee et al., 2023).This emerging concept has sparked widespread interest and enthusiasm while also giving rise to debates and controversial opinions (Ivanov, 2023).After several development iterations, a prevailing consensus has emerged that Industry 5.0 does not constitute an independent industrial revolution; instead, it is a policy framework that builds upon the advancements achieved in Industry 4.0 (Ghobakhloo et al., 2023a).Its primary objective is to govern and regulate the trajectory of Industry 4.0 progression (Breque et al., 2021).Therefore, it is evident that Industry 5.0 should be understood within the context of over a decade of advancements and progress in Industry 4.0 (Huang et al., 2022).It emerges as a phenomenon that builds upon the foundation laid by its predecessor, leveraging the cumulative knowledge, technological innovations, and transformative potential of Industry 4.0 (Müller, 2020;Renda et al., 2022).
The ongoing discourse on Industry 5.0 has sparked attention and controversies, especially for companies shaping their future digitalization strategies (Hein-Pensel et al., 2023).As Industry 5.0 gains momentum alongside the persistent influence of Industry 4.0, businesses face the challenge of determining whether Industry 4.0 remains a viable Extended author information available on the last page of the article framework or if a shift to Industry 5.0 is already necessary (Huang et al., 2022).A key debate centres on the technological aspects of Industry 5.0.While some view it primarily as a governance framework, others argue for its close association with technological advancements, particularly the commercialization of generative artificial intelligence (Maddikunta et al., 2022).This dual perspective complicates strategic decisions for companies aiming to balance productivity and societal values.Navigating this landscape requires a nuanced understanding of the interplay between governance and technology, which has been significantly lacking within the literature.
Therefore, and within the realm of Industry 5.0, two significant knowledge gaps require further exploration and understanding.Firstly, there is a need to uncover the reasons behind the swift and unprecedented rush towards Industry 5.0.Despite Industry 4.0 still being in the process of maturation and widespread implementation (Cañas et al., 2021), the emergence of Industry 5.0 has sparked intense debates and propelled its adoption (Müller, 2020).To address this knowledge gap, it is crucial to delve into the factors driving this rapid shift, including the influence of technological advancements, socio-economic factors, policy initiatives, and market forces.Understanding the motivations and drivers behind the accelerated push towards Industry 5.0 will shed light on the underlying forces shaping this phenomenon.Understanding the drivers behind the swift adoption of Industry 5.0 is not just insightful but a critical necessity for companies aiming to stay competitive and strategically positioned.Unfortunately, this crucial knowledge is deeply underdeveloped, resulting in missed opportunities for informed investment, strategic innovation, and proactive risk mitigation during digital industrial transformation.Without a clear comprehension of the driving forces, companies may struggle to optimize operational efficiency, integrate sustainable practices, and attract and retain top talent in an industry undergoing rapid transformation.In essence, the absence of this essential knowledge poses a significant challenge for companies seeking sustained success in a dynamic and evolving business landscape.
Secondly, it is imperative to explore how the ongoing digital industrial transformation can be effectively managed to achieve the overarching objectives that Industry 5.0 prioritises.Industry 5.0 aims to create a sustainable, human-centric, and resilient future industry (Ghobakhloo et al., 2022;Karmaker et al., 2023).However, realising these objectives requires a comprehensive understanding of the mechanisms, strategies, and frameworks needed to facilitate the successful integration and governance of digital technologies within the industrial ecosystem.Addressing this knowledge gap involves examining the best practices, policies, and approaches that can maximise the positive impacts of digitalisation while minimising potential negative consequences.It entails exploring the role of various stakeholders, including businesses, governments, labour unions, and society at large, in ensuring that the ongoing digital industrial transformation aligns with the core objectives of Industry 5.0.For companies developing their future digitalization strategy, the lack of a comprehensive understanding regarding the management of the ongoing digital industrial transformation poses a significant challenge.Industry 5.0 envisions a future industry characterized by sustainability, human-centricity, and resilience.However, navigating the complexities of the digital industrial landscape becomes challenging without a thorough grasp of essential mechanisms, strategies, and frameworks for integrating and governing the digital technologies of Industry 4.0.This knowledge gap impedes the development of informed solutions aligned with Industry 5.0's goals, hindering the optimization of positive impacts while mitigating potential negative consequences among organizations.Consequently, this challenge jeopardizes companies' ability to shape their digitalization strategies in alignment with Industry 5.0's envisioned future industry, hindering progress toward a transformative and harmonized industrial landscape.
Accordingly, the study pursues two primary objectives to bridge the identified knowledge gap.The first objective is to comprehensively grasp the unprecedented emergence of Industry 5.0, probing into potential connections with the corporate and societal impacts of Industry 4.0.The second objective is to pinpoint the sustainability mechanisms within Industry 4.0 that have demonstrated realworld viability, subsequently exploring the feasibility of leveraging these mechanisms to align corporate digital transformation with the socio-environmental values inherent in Industry 5.0.
In addressing the first objective, the present study draws on the sustainability perspective and systematically reviews the positive and negative contributions of Industry 4.0 to the economy, environment, and society.The literature proposes that Industry 4.0 represents a technoeconomic phenomenon involving the digital transformation of value networks across various industries (Shayganmehr et al., 2021).Although Industry 4.0 mainly centres around the digitalisation of industrial entities, its ripple effects reach far beyond the business floor.The industrial transformation under Industry 4.0 and, in many cases, the disruptive technological innovations pushing such transformation also impact the environment and society (Kovacs, 2018).Literature provides controversial perspectives on the contribution of Industry 4.0 to sustainability, depending on the scope and level of analysis.For example, as the core objectives of Industry 4.0, productivity and efficiency reduce resource consumption and waste across industrial operations (Enyoghasi & Badurdeen, 2021).Therefore, Industry 4.0 and the underlying digitalisation may contribute to cleaner production operations at the micro-industrial1 analysis level (Mubarik et al., 2021).Besides, the information processing and interconnectedness capabilities of Industry 4.0 may offer unique opportunities for environmental and social sustainability (Stock et al., 2018).
Conversely, the literature acknowledges that Industry 4.0 is a technology-driven phenomenon that systematically disregards many aspects of socio-environmental sustainability, especially at the meso (e.g., supply chain) and macroregional analysis levels (Kovacs, 2018;Soh & Connolly, 2020, 2021).For example, experts are deeply concerned about the negative social-environmental impacts of Industry 4.0, such as job exclusivity, income polarisation, digital divide, business fragility, and rebound effect (Grybauskas et al., 2022).Since the literature tends to provide a vague understanding of Industry 4.0 adverse effects on sustainability, the present study conducts a content-centric review of Industry 4.0-sustainability associations to explain better what functional and technological design flaws of Industry 4.0 have led to the prevalence of Industry 5.0 agenda.
To address the second objective, the study draws on the literature and experts' opinions to answer the second research question of how ongoing digital industrial transformation could address Industry 5.0 key goals.We acknowledge that while preceding industrial revolutions took decades to unfold, Industry 5.0 seems to coexist with Industry 4.0 as a parallel phenomenon.As a sociotechnical phenomenon, Industry 5.0 directly addresses significant shortcomings of Industry 4.0: being a purely technology-centred and profit-driven phenomenon.From this perspective, Industry 5.0 entails regulating and managing the digitalisation pushed by Industry 4.0, leading to an eco-friendlier, humancentric, and resilient future industry (Huang et al., 2022).Consistently, the present study aims to identify the functions through which the ongoing digital industrial transformation can contribute to developing the core objectives of Industry 5.0.The study aims to identify the interrelationships among these functions and map them into an interpretive roadmap of a human-centric, sustainable, and resilient industry that facilitates the Industry 5.0 agenda.
We employs a comprehensive and novel exploratory research method to achieve the research objectives.The decision to adopt an exploratory research design stems from the limited maturity and emerging nature of the Industry 5.0 literature.Both Industry 4.0 and Industry 5.0 represent expansive and dynamic domains that are constantly evolving.Furthermore, there is a notable dearth of sufficient theoretical development explaining how the sustainability mechanisms of Industry 4.0 interact to drive the objectives of Industry 5.0.Therefore, we drew on the exploratory research design to explore these complex and underdeveloped facets.
To achieve the research objectives, our methodology starts by conducting a content-centric evidence synthesis of Industry 4.0 literature to perform evidence mapping of Industry 4.0 sustainability performance.By doing so, the study identifies the positive and negative contributions of Industry 4.0 to various aspects of sustainability, allowing us to identify techno-functional weaknesses of this phenomenon that lead to the unforeseen emergence of the Industry 5.0 agenda.The study further builds on the evidence synthesis of Industry 4.0 literature to identify sustainability functions essential to developing Industry 5.0 objectives.The study captures experts' opinions on the sustainability functions identified and applies a novel Hesitant-Fuzzy set (HFs) Interpretive Structural Modelling (ISM) approach to identify and model the interdependencies among the functions.The resulting scenarios explain how the sustainability functions of Industry 4.0 should be leveraged to promote three central sustainability objectives of Industry 5.0 under various unpredictability levels of business uncertainties.
The study is believed to offer important theoretical implications.The content-centric literature review reveals that Industry 4.0 has controversial implications for sustainability.While it has positively impacted economic and environmental sustainability at micro and meso levels, its effects on social and macro sustainability are inconclusive.These findings help explain the acceleration towards Industry 5.0, which aims to govern and regulate Industry 4.0's digital transformation to prioritise socio-environmental goals alongside productivity.The study also identifies the potential of Industry 4.0 functions to promote sustainability values and proposes a novel approach, HF-ISM, to understand how these functions should interact to fulfil Industry 5.0's sustainability objectives.
The study's HF-ISM approach offers notable practical implications, boosting understanding of the sequential interaction of sustainability functions within Industry 4.0.Three scenarios were identified based on different levels of business uncertainties.In Scenario 1, mature and stable corporations can capitalise on the innovation opportunities of Industry 4.0, enabling other sustainability functions simultaneously.Scenario 2 emphasises leveraging functions like business risk management, smart product integration, and supply chain performance to promote sustainability strategies and resource efficiency.Scenario 3, applicable to highly turbulent environments, prioritises automation, circularity, and real-time communication capabilities to adapt to unpredictable changes.These scenarios highlight the importance of synergy and sequence in leveraging Industry 4.0 functions to align with the sustainability values of Industry 5.0.Businesses should consider their internal and external environments to determine the most suitable scenario.Regardless of the scenario, each function uniquely promotes Industry 5.0 sustainability values, emphasising the need to consider all sustainability functions in governance strategies.

Background
In this section, we provided a synoptic overview of the evolution of the Industry 5.0 agenda, discussing its core objectives.We further conducted the evidence synthesis of Industry 4.0-sustainability literature to identify to what extent the ripple effects of Industry 4.0 have been aligned with sustainability values.

Synoptic Overview of Industry 5.0
Even though the Industry 5.0 concept is nascent, it has constantly evolved over the past few years.Industry 5.0 was first introduced in the literature around 2016, with Sachsenmeier (2016) suggesting that it signifies a significant geostrategic transformation driven by the progress in synthetic biology technologies.Özdemir and Hekim (2018) criticised the systematic vulnerability of the Industry 4.0 ecosystem and proposed that Industry 5.0 capitalises on symmetrical innovation to democratise knowledge via orchestrated utilisation of disruptive technologies like AI, big data, and IoT.These early speculations were contradicted by an emerging school of thought arguing that Industry 4.0 inadvertently disregards humans within the industrial context (Longo et al., 2020).Therefore, scholars such as Doyle Kent and Kopacek (2021) and Nahavandi (2019) proposed that Industry 5.0 would represent a technological revolution that empowers manmachine symbiosis and assists human operators, particularly in manufacturing.
European Commission cautiously approached this concept in 2020 and acknowledged a few controversies that might be associated with the term 'Industry 5.0' (Müller, 2020).For example, Industry 4.0 is still evolving, and many businesses, particularly smaller ones, are far behind industry leaders in implementing the technological constituents of Industry 4.0.Second, Industry 4.0 and Industry 5.0 are similar on various fronts, especially concerning the fundamental technologies, design principles, and productivity objectives.Third, prior industrial revolutions, including Industry 4.0, have all been pushed by technological innovation, whereas Industry 5.0 appears to be pulled by socio-environmental values (Müller, 2020).In the 2021 policy brief, the European Commission held a firmer position toward this emerging concept and explained that Industry 5.0 complements Industry 4.0 in recognising the value of digital industrial transformation for preserving the environment and society (Breque et al., 2021).From this perspective, Industry 5.0 cannot be regarded as the chronological substituent of Industry 4.0.As a forward-looking agenda, it instead builds on the hallmark technologies, principles, and components of Industry 4.0 to promote sustainability, mainly manifested in environmentalism, human-centricity, and economic resilience.European Commission offered a more resolute opinion regarding Industry 5.0 in their 2022 policy brief and explicitly declared that Industry 4.0 can no longer serve as an appropriate agenda for Europe's future goals (Renda et al., 2022).This policy brief argued that while both concepts share certain technological and techno-functional similarities, Industry 5.0 supersedes its predecessor in providing the directionality needed for a competitive and sustainable future industry.Viewed from this perspective, the intended values of Industry 5.0 expand beyond productivity-driven economic growth, involving economic circularity, environmental sustainability, human-centricity, social values, and long-run resilience (Renda et al., 2022).This perspective proposes that Industry 5.0 can manifest in the stakeholder-driven governance of ongoing digital industrial transformation.
Recent studies have widely accepted the European Commission's perspective on the scope and objectives of Industry 5.0 (Huang et al., 2022;Maddikunta et al., 2022).Indeed, the most recent contributions to the scholarly literature widely acknowledge that Industry 5.0 goes beyond the value-centricity of Industry 4.0 by pursuing sustainability values (Ivanov, 2022).In particular, the Industry 5.0 reference model by Ghobakhloo et al. (2022, p. 719) explains that this phenomenon should not be merely regarded as "economic-productivity driven as it systematically pursues balancing economic and socio-environmental sustainability."They further highlight that under the Industry 5.0 agenda, economic and socio-environmental aspects of sustainability are interlinked, and synergetic complementarity among various sustainability goals of Industry 5.0 can offer valuable implications for sustainable development.
Following the European Commission's perspective on the sustainability goals of Industry 5.0 and studies that endorse such a standpoint (e.g., Ghobakhloo et al., 2022;Ivanov, 2022), the present study postulates that the core objective of Industry 5.0 involves promoting the economic, environmental, and social aspects of sustainability at the microscopic, mesoscopic, and macroscopic scales.Nevertheless, our study takes a forward-looking approach to operationalizing the Industry 5.0 concept.
The present study aligns with the prevailing perspective that Industry 5.0 serves as a socially driven governance agenda, redirecting the ongoing digital industrial transformation (referred to as Industry 4.0) toward inclusive sustainability (Sindhwani et al., 2022).By introducing technology and business governance policies, Industry 5.0 regulates the pace of Industry 4.0 transformation, guiding the digital business landscape toward societal values.Achieving the ambitious societal goals associated with Industry 5.0 demands purposeful management and leveraging of Industry 4.0 technologies and design principles (Huang et al., 2022).However, it is crucial to recognize the emergence of generative artificial intelligence, exemplified by tools like ChatGPT, as a significant technological milestone with the potential to shape a new industrial era (Ooi et al., 2023).Recent studies acknowledge generative artificial intelligence as a critical technological component of Industry 5.0 (e.g., Ghobakhloo et al., 2023b), suggesting transformative power that could position Industry 5.0 as the next phase of industrial transformation.These unprecedented technologies are reshaping business dynamics and may extend beyond the trajectory of Industry 4.0.
In light of these emerging technologies, Industry 5.0 can be understood in two ways.First, it can be regarded as a policy agenda driven by social factors and propelled by technological advancements, aiming to capitalize on the potentials offered by Industry 4.0 technologies while maintaining a balance between economic growth and socio-environmental development (Huang et al., 2022).Second, Industry 5.0 may have the potential to be considered the next industrial revolution, especially with emerging technologies like general artificial intelligence appearing to cause a significant shift in the industrial development landscape (Ghobakhloo et al., 2023b).While our present study aligns more with the first perspective, we also acknowledge the importance of recognizing the second perspective.

Evidence Synthesis of Industry 4.0-Sustainability Literature
The study conducted a content-centric evidence synthesis of the literature to identify (1) positive or negative contributions of Industry 4.0 to various sustainability aspects and (2) functions based on which Industry 4.0 may contribute to sustainability.Following the existing guidelines (e.g., Webster & Watson, 2002;Watson & Webster, 2020), evidence synthesis of the literature in this study involves multiple steps explained in Fig. 1.
Step A1 of the evidence Fig. 1 Steps for conducting the content-centric synthesis of Industry 4.0-sustainability literature synthesis involved using the search string presented in Fig. 1 to search Scopus and Web of Science databases to identify relevant documents.Keywords such as human or resilience were included in the search string because the Industry 5.0 concept prioritises human centricity, resilience, and sustainability (Ivanov, 2022;Renda et al., 2022).The search in step A1 was conducted in mid-2022, in which no specific limitations such as date range were applied.As explained in Fig. 1, executing step A1 identified 2324 potentially related documents.
Step A2 entailed subjecting the document identified across step A1 to the exclusion criteria in Table 1.To ensure the reliability and dependability of findings, exclusion criterion 1 limited the eligibility documents to peer-reviewed academic journal articles.Exclusion criteria 3 and 4 ensured that the eligible articles shortlisted would provide meaningful insights into Industry 4.0-sustainability interactions.Overall, the decision to use exclusion criteria in Table 1 is widely supported by comparable review studies within the Industry 4.0 literature (e.g., Ching et al., 2022;Ghobakhloo et al., 2021a).Subjecting the 2324 identified documents to the exclusion criteria resulted in excluding 1873 documents.As a result, 451 articles were shortlisted under the initial pool of eligible journal articles.
Step B1 concerned the backward review of the eligible articles shortlisted in step A2.This step involved screening the reference section of the 451 eligible articles and identifying documents that mention Industry 4.0 or any related keywords within their title.Step B1 identified 542 unique documents not previously identified across step A1.In step B2, these documents were subjected to the exclusion criteria, which resulted in the exclusion of 495 documents.Step B2 led to the secondary pool of 47 eligible journal articles.Next, the forward review of eligible articles was conducted in step C1.In this step, the research team used Google Scholar, Web of Science, and Scopus platforms to identify related documents that cited any of the 498 (451 + 47) eligible articles identified across steps A2 and B2.Step C1 identified 316 unrecognised documents across steps A1 and B1.Step C2 involved applying the exclusion criteria to these newly identified documents, removing 287 ineligible documents.As a result, the tertiary pool of 29 eligible articles was established in step C2.Steps A2, B2, and C2 collectively led to the final pool of 527 articles eligible for content analysis.
In Step D of the evidence synthesis, which entailed the manual content analysis and evidence mapping of eligible articles, a meticulous and rigorous approach was followed to ensure the credibility and robustness of the findings.
A data-driven methodology was employed for theme generation, where themes emerged organically from the content analysis process.The coding phase involved a meticulous line-by-line examination of the eligible articles, facilitating the identification of meaningful information units.This detailed approach ensured a thorough exploration of the text, preserving a granular level of analysis.From the coded data, descriptive themes were developed, encapsulating the principal areas of focus and content about the sustainability outcomes of Industry 4.0 across three levels of analysis and three sustainability pillars.These descriptive themes provided a comprehensive and systematic overview of the information.
Furthermore, the analysis proceeded beyond the descriptive themes, further exploring the data to generate analytical themes.This involved a comprehensive exploration of the relationships, connections, and implications within the data, enabling the identification of key concepts and perspectives that contributed to a more nuanced understanding of the topic.The analytical themes represented a higher level of abstraction, shedding light on the interconnections, contradictions, and emerging trends in the literature.Through this rigorous process, a comprehensive and nuanced analysis of the collected data was achieved, facilitating the identification of the sustainability functions of Industry 4.0.
To establish the reliability and validity of the findings, the research team adhered to established guidelines and best practices in qualitative research (e.g., Thomas & Harden, 2008;White & Marsh, 2006).Independent content assessors conducted the content analysis, ensuring an objective data evaluation.Any disagreements or discrepancies in findings were meticulously tracked and addressed at the individual article level.Extensive discussions and comparisons were undertaken among the research team members to reach a shared consensus on the content analysis findings.This iterative process enhanced the reliability and validity of the analysis by minimising subjectivity and ensuring the robustness The document is not categorised as a peer-reviewed academic journal article (e.g., conference papers or proceedings).2 The article is not written in English.3 The article uses the search keywords merely in the title/abstract/keywords and provides no insight into the Industry 4.0 phenomenon.4 The article does not discuss the implications of Industry 4.0 for sustainability whatsoever.
of the interpretations.The research team further applied evidence mapping to visually classify and compare the Industry 4.0 areas of impact in sustainability.Evidence mapping is a user-friendly modern methodology commonly used to provide a high-level visual overview of the state of evidence over a specific phenomenon and its impacts (Kondo et al., 2019).The content analysis results are discussed in the following sections.

The Sustainability Impacts of Industry 4.0
Content analysis results revealed that scholars had studied the sustainability implications of Industry 4.0 across various analysis levels and impact areas.Eligible articles frequently drew on the triple bottom line framework to separately report the economic, environmental, and social sustainability implications of Industry 4.0 (Nara et al., 2021).Alternatively, the literature commonly distinguishes the micro-sustainability impacts of Industry 4.0 from macroscale impacts (Adamik & Sikora-Fernandez, 2021).The present study adapts to these classifications and presents the sustainability implications of Industry 4.0, as shown in Fig. 2.This figure structures the Industry 4.0 sustainability implications in the form of a three-by-three matrix based on analysis levels and impact areas.Under the analysis levels, the microscopic level refers to the organisational analysis level, where Industry 4.0 outcomes are assessed in the individual or firm context.The mesoscopic level mainly concerns evaluating Industry 4.0 outcomes at the supply chain (or specific regional business sector) level, whereas the macroscopic level relates to large-scale Industry 4.0 outcomes at the societal or global scale.The impact area in Fig. 2 consists of the economic, environmental, and social pillars of sustainability, which are thoroughly discussed and elaborated on within the literature (Toktaş-Palut, 2022).This classification in Fig. 2 leads to 9 blocks and sustainability impact, from the micro-economic block to the macro-social block.Each block lists the underlying sustainability indices among the eligible articles along with their respective acknowledgement rate.For example, under the micro-environmental block, 12.524% of eligible articles acknowledged that Industry 4.0 significantly impacts the resource consumption efficiency of individual firms.
The study draws on the results of evidence synthesis and develops the evidence map of Industry 4.0's sustainability implications, as shown in Fig. 3.This figure is compatible with Fig. 2 in the sense that it offers similar categorisation of Industry 4.0 sustainability implications under similar blocks.However, this map explicitly describes the extent to which Industry 4.0 positively or negatively impacts each sustainability index, as perceived by the scholarly literature.As seen in the legend part of Fig. 3, rectangles of four different sizes have been used to depict the acknowledgement level (rate) of each sustainability index.For example, the smallest rectangle represents sustainability indices with an acknowledgement rate of less than 3% (among the 527 eligible articles), while the largest rectangle represents sustainability indices with an acknowledgement rate of more than 9%.The green colour in Fig. 3 should be inferred as the positive impact of Industry 4.0 on a specific sustainability index, whereas the red colour should be interpreted as a negative impact.The proportionality of green colour to red colour in a given rectangle corresponds to the extent to which Industry 4.0 has been reported to positively or negatively impact a given sustainability index.Figures 2 and 3 collectively describe how the literature has observed Industry 4.0 to positively or negatively impact various aspects (indices) of sustainability.
Figures 2 and 3 show that the micro-economic sustainability implications of Industry 4.0 have received the most attention within the literature.Eligible articles have identified 15 sustainability indices under this block.Results reveal that Industry 4.0 contribution to micro-economic sustainability has been dominantly positive.The most acknowledged contribution of Industry 4.0 to this area involves enhancing the industrial productivity and operational cost-saving of individual firms (Kiel et al., 2017;Strandhagen et al., 2020).Indeed, the literature offers detailed insights into how Industry 4.0 may promote sustainability indices under this block.For example, scholars such as Chen et al. (2021) and Dev et al. (2020) explained how industrial units could draw on disruptive technological constituents of Industry 4.0, including additive manufacturing, industrial robotics, and digital twin, to promote product and process innovation.Not all scholars believe that Industry 4.0 contributions to microeconomic sustainability are unconditionally positive, particularly concerning productivity, organisational resilience, and production reliability (e.g., Chiarini et al., 2020;Chiarini, 2021;Dalenogare et al., 2018).While acknowledging these negative impacts, scholars such as Ghobakhloo and Fathi (2020) and Song et al. (2022) argue that Industry 4.0 technologies inherently favour productivity and performance improvement.However, they can cause temporary operational disruption and productivity loss during the initial implementation stages.Alternatively, the cybersecurity immaturity of implementing firms may allow malicious actors to target Industry 4.0 technologies and hamper the resilience or reliability of business operations (Bécue et al., 2021).
Content analysis results also identified seven microenvironmental sustainability indices, which, in most cases, have been positively affected by Industry 4.0.In particular, the literature widely acknowledges that Industry 4.0 enables individual firms to improve resource consumption efficiency (Dixit et al., 2022;Margherita & Braccini, 2020), reduce waste (Psarommatis et al., 2021), and increase material flow efficiency (Sun et al., 2022;Vlachos et al., 2021).These positive micro-sustainability contributions generally root in Industry 4.0 unique features, such as continuous realtime process monitoring (Mishra et al., 2018) or AI-driven Fig. 3 The evidence map of the positive and negative impacts of Industry 4.0 on various aspects of sustainability resource management and prioritisation optimisation (Amjad et al., 2021;Fathi & Ghobakhloo, 2020).Industry 4.0 also allows businesses to use AI, big data analytics, and predictive models to develop smart-hiring platforms that identify suitable talents with the needed sustainability competencies (Ghobakhloo et al., 2021a).Scholars also report that smart human resource platforms under Industry 4.0, also known as HRM4.0, can offer analytical insights into employees' sustainability productivity (Rana & Sharma, 2019) and help the management team to develop better sustainability training and development programs for employees (Al Amiri & Shawali, 2021;Vereycken et al., 2021).Nonetheless, the literature highlights a few cases where Industry 4.0 negatively impacts some micro-environmental sustainability indices (Oláh et al., 2020).For example, smart manufacturing facilities have much higher energy consumption due to the intensive energy needs of industrial robots, automated guided vehicles, or sensor-equipped and connected machinery (Chiarini, 2021).In addition, the dimensionality and complexity of intelligent production systems and smart products under Industry 4.0 challenge the implementation of circularity and sustainable operations (Abdul-Hamid et al., 2020;Hennemann Hilario et al., 2022).
Contrary to the micro-economic and environmental blocks, the literature reports Industry 4.0 implications as mostly negative for micro-social sustainability indices.The application of more intelligent collaborative robots, smart industrial wearables, and AI-enabled real-time monitoring of machinery and facilities offer valuable opportunities for promoting work environment safety (Bi et al., 2021;Min et al., 2019).Industry 4.0 also improves job satisfaction, given that it promotes manual labour to decision-makers or problemsolvers by supplying them with visualised information in real-time and automating exhausting and unergonomic tasks (Longo et al., 2017(Longo et al., , 2022)).Nevertheless, Industry 4.0 adversely impacts employee privacy, income equality, job security, and workplace dignity within individual businesses (Jr et al., 2022;Melé, 2021;Soh & Connolly, 2020).Under the Industry 4.0 environment, workers' psyches are constantly challenged by job insecurity, given that lower-skilled or repetitive jobs can always be lost to autonomous machines (Malik et al., 2022;Müller, 2019).The continuous and realtime monitoring feature of Industry 4.0, which can very well be extended to invasive employee monitoring, cause service privacy and security concern among employees, examples of which include unfair autonomous decisions based on monitored productivity data, excessive micromanagement, or accessing private social media content (Soukupová et al., 2020;Tong et al., 2021).
The meso-economic sustainability implications of Industry 4.0 are dominantly positive.The literature comprehensively explains how various technological constituents of Industry 4.0 can collectively improve supply chain productivity, profitability, innovation, agility, and resilience (Fatorachian & Kazemi, 2021).Industry 4.0 draws on the integrability of big data analytics, cloud computing, CPS, and IIoT to materialise the digital supply network concept (Tsolakis et al., 2023), in which autonomy, real-time data sharing, and self-monitoring capabilities improve collaboration, decision processes, responsiveness, and productivity across supply partners (Birkel & Müller, 2021).Eligible articles further reveal that Industry 4.0 promotes supply chain resilience by supporting essential enablers like transparency, traceability, adaptability, cost-effectiveness, and continuity management (Ivanov & Dolgui, 2021;Mubarik et al., 2021).Industry 4.0 contribution to supply chain profitability involves several micro functions, such as collaborative real-time planning (Reyes et al., 2021), new service-orientated business models (Hahn, 2020), improved performance management (Xie et al., 2020), and logistics efficiency (Sun et al., 2022).Nonetheless, the digital transformation of supply chains under Industry 4.0 requires significant financial investment and reengineering of business and supply chain processes, causing temporary productivity losses (Sharma et al., 2021).Scholars also argue that the mismanagement of Industry 4.0 risk (e.g., cybersecurity) in logistics and supply chain operations has been a critical threat to supply chain productivity, profitability, and resilience (Ghadge et al., 2020;Pandey et al., 2021).
According to Fig. 3, Industry 4.0 positively impacts the majority of meso-environmental sustainability indices.For example, literature provides detailed explanations of how supply chains can draw on Industry 4.0 technologies (e.g., IoT, data analytics, or robotics) and unique features (e.g., service orientation or real-time capability) to develop circular strategies or business models such as Products-as-a-Service (PaaS) or cloud manufacturing (Mastos et al., 2021).In particular, the literature details how Industry 4.0 promotes supply chain-level intelligent waste management by addressing critical operational challenges of waste disposal and management activities such as speed, value recovery, and operating costs (Lopes et al., 2021;Zhang et al., 2021).Researchers have also shown how Industry 4.0-enabled technology intervention can optimise urban waste management systems (Kanojia & Visvanathan, 2021) and reduce value network-level pollution (Bag et al., 2021a).Although Industry 4.0 has been positively associated with supply chain sustainability, circularity, and sustainable partnership, the literature reports some negative associations in rare cases.For example, supply chain digitalisation under Industry 4.0 is challenged by the complexity of digital transformation, trust issues, and data ownership concerns (Kache & Seuring, 2017;Luthra & Mangla, 2018), which negatively impact sustainable partnerships (Pandey et al., 2021) and prevent the integration of product life cycle management into supply chain strategies (Dolgui & Ivanov, 2020;Ghobakhloo et al., 2021a).
The literature provides controversial evidence on the implications of Industry 4.0 for meso-social sustainability.Industry 4.0 has given birth to the concept of product individualisation (Saniuk et al., 2020a), given that its underlying technologies (e.g., additive manufacturing) and design principles, such as customer integration or servitisation, provide the necessary manufacturing flexibility and cost-efficiency to produce highly individualised consumer goods (Fathi & Ghobakhloo, 2020;Leng et al., 2020).The horizontal integration and smart product features of Industry 4.0 have taken customer communication and engagement to the next level, enhancing customer satisfaction (Frank et al., 2019a, b).Nonetheless, scholars are deeply concerned about the negative impacts of Industry 4.0 on employment, job displacement, and skill crises at the supply chain or intraregional levels (e.g., Bhattacharyya & Mitra, 2020;Pardi, 2019).Industry 4.0 is radically pushing the implementation of smart technologies across supply chains, requiring employees and managers to be significantly skilled in soft computing and engineering skills such as data science (Fareri et al., 2020).As a result, most businesses struggle with upskilling issues and acquiring much-needed talents (Ayinde & Kirkwood, 2020;Mefi & Asoba, 2020).Although Industry 4.0 is creating new unheard jobs, it eliminates a significant portion of low-skilled and repetitive tasks across industrial value networks (Margherita & Braccini, 2021;Müller, 2019;Sung, 2018).Indeed, predictive models show that Industry 4.0 might displace or restructure up to 40% of jobs, intensifying employment disruption and skill discrepancy issues (Haiss et al., 2021).
Industry 4.0 can be a double-edged sword for macroeconomic sustainability, as it can positively and negatively impact long-term and equitable economic growth.Scholars argue that Industry 4.0 inherently favours macro-economic growth (Ghobakhloo et al., 2021b).Nonetheless, the digital transformation of regions under Industry 4.0 has been spatially uneven, favouring peripheral regions significantly less over dynamic ones (Barzotto et al., 2020;Greef & Schroeder, 2021).Industry 4.0 promotes macroregional innovation excellence, but technologically specialised regions benefit more significantly from the digital industrial revolution (Ciffolilli & Muscio, 2018;Hilpert, 2021).Concerns regarding Industry 4.0 and unequal economic development of regions are not limited to the European region.For example, Chiengkul (2019) criticises the Thailand 4.0 agenda for intensifying Thailand's fragmented political economy and providing more advanced economic sectors with exclusive opportunities for growth under the Industry 4.0 agenda.Similarly, literature provides controversial arguments on the macro-economic impacts of servitisation, platformisation, and monopolisation pushed by Industry 4.0 (Durand & Milberg, 2020;Rainnie & Dean, 2020).Although the progressive application of disruptive Industry 4.0 technologies, such as AI or big data analytics, has been valuable to the economic and innovation growth of regions, it has adversely intensified the macro-economic inequality issues associated with intellectual monopoly capitalism and information monopoly (Durand & Milberg, 2020;Rikap, 2022), pushed mainly by tech giants (Rikap & Lundvall, 2022).
Figure 3 shows that Industry 4.0 contribution to macroenvironmental sustainability indices is controversial.On a positive note, Industry 4.0 promotes macro-environmental sustainability by facilitating large-scale collaboration and partnership on environmental protection and progressing circular economy worldwide (Bai et al., 2022;Mastos et al., 2021).While Industry 4.0 combats climate change by introducing productivity and resource efficiency into industrial operations (Ghobakhloo & Fathi, 2021), the energy intensity of its underlying technologies expedites environmental deterioration (Chiarini, 2021).Digitalisation under Industry 4.0 relies on numerous infrastructural requirements, from countless hardware, battery-based storage systems, and cabling infrastructure to extensive cooling systems for data centres (Ghobakhloo & Fathi, 2021;Nara et al., 2021).These infrastructural requirements are creating an ever-increasing demand for natural resources and rare materials such as neodymium, which, in many cases, are acquired or extracted via non-environmentally friendly operations (Markard, 2020).More importantly, smarter and more electronically complex consumer goods, computer electronics used across Industry 4.0 systems, and supporting infrastructure such as cabling systems have a much shorter lifespan due to the ever-increasing innovation speed (Ching et al., 2022;Shi et al., 2020).Recycling decommissioned hardware and digital infrastructure has proven challenging and expensive, intensifying environmental degradation (Rene et al., 2021).
Industry 4.0 implications for macro-social sustainability have been primarily negative.The ever-changing distribution of jobs caused by Industry 4.0 generally increases high-wage employment while reducing lower-skilled and medium-wage occupations, raising inequality across various countries (Jr et al., 2022;Mönnig et al., 2019).While Industry 4.0 increases the prevalence of digital devices and products, the underlying income inequality and polarisation intensify the digital divide, worsening the current social exclusion crisis (Hayriye & Fatma, 2020;Wei & Peters, 2019).In addition, socio-economic digitalisation under Industry 4.0 has been associated with critical side effects, such as digital capitalism or excessive automation, which weaken social relationships and undermine the role of human agency in socio-economic values (Rikap, 2022;Xu et al., 2021).On a positive note, regional advancement in Industry 4.0 promotes digital literacy via interrelated mechanisms.Applying Industry 4.0 technologies in the education system enhances fresh graduates' digital literacy (Jamaludin et al., 2020).Alternatively, universities nowadays offer novel Industry 4.0-focused interdisciplinary programs that equip graduates with technical skills in Industry 4.0 technologies (Karre et al., 2017).Industry 4.0 also requires businesses to train their employees on the skills needed by digitalisation (Agarwal et al., 2021).Under Industry 4.0, customers must improve their digital literacy to interact better with smart products and services (Wang & Wu, 2021).

HF-ISM Methodology
To classify the functions through which Industry 4.0 promotes the sustainability goals of Industry 5.0 (from now on called Industry 4.0 sustainability functions) with different scenarios of uncertainty and to present level-based conceptual models for the relationship amongst these functions, a novel Hesitant-Fuzzy set (HFs) approach has been integrated with Interpretive Structural Modelling (ISM) known as HF-ISM.The novel approach allows experts to share their experience, intuition, and hesitation while completing the questionnaires and dealing with real-world uncertainty.Hence, this research benefits from a three-phase research framework, as shown in Fig. 4. In the first stage, nine sustainability functions of Industry 4.0 were identified through the content-centric literature review.Afterwards, data gathering and scenario analysis were implemented based on the hesitant questionnaire used in this research.Eventually, the HF-ISM-MICMAC approach was applied to classify the functions and illustrate the level-based conceptual models.Details of the research framework have been explained in Fig. 4.

Identifying Sustainability Functions of Industry 4.0
The content-centric literature review and underlying results indicate that none of the technological constituents or design principles of Industry 4.0 inherently defy sustainability priorities.Indeed, the literature acknowledges that the mismanagement of digital transformation under Industry 4.0 causes negative contributions to sustainability indices (Müller, 2020;Renda et al., 2022).Content analysis results identified nine functions through which Industry 4.0 and the underlying digitalisation, if appropriately managed, can promote various sustainability indices and fulfil the key objectives of the Industry 5.0 agenda, including environmental sustainability, human-centricity, and resilience.Notably, the sustainability functions of Industry 4.0 refer to the practical roles and capabilities of Industry 4.0 constituents (including technologies and design principles) in promoting sustainability.These functions represent the tangible ways that Industry 4.0 contributes to sustainable outcomes by addressing environmental, social, and economic challenges through specific actions and capabilities.It is also worth mentioning that while some of these functions may be found outside the realm of Industry 4.0, the integration of advanced technologies such as automation, artificial intelligence, the Internet of Things, and data analytics sets Industry 4.0 apart.Industry 4.0 offers a unique and unprecedented capability to deliver sustainability functions more efficiently and synergistically.
The comprehensive suite of interconnected sustainability functions and the underlying technological capabilities allow Industry 4.0 to uniquely boost sustainability beyond what can be achieved with individual solutions.These functions are concisely explained in the following section.
Business Risk Monitoring and Management (BRM) Industry 4.0 involves developing a hyperconnected business environment where industrial control systems, IIoT, cloud technologies, and intelligent suites provide proactive and real-timeoriented monitoring of core business processes (Mishra et al., 2018).The BRM function of Industry 4.0 streamlines business operations by proactively sensing business disruptions and safeguarding mission-critical processes from technical problems (Bazan & Estevez, 2022).This function further addresses the significant shortcomings of traditional risk management through (1) removing information silos and creating an integrated risk management system, (2) predicting the dynamic impact of risk factors across various business functions, (3) forecasting the overall impact of risk management scenarios across business functions, and (4) providing a holistic real-time overview of internal and external risks (Ivanov & Dolgui, 2021;Spieske & Birkel, 2021).AI-driven predictive analytics, big data analytics, IoT, and blockchain-driven information handling are critical enablers of BRM under Industry 4.0 (Ivanov et al., 2019).ERM contributes to sustainability by increasing the transparency of end-to-end business processes, preventing operational disruption, and improving industrial entities' environmental compliance and resource utilisation efficiency (Kazancoglu et al., 2021;Viriyasitavat et al., 2020).
Circular Smart Products (SCP) Industry 4.0 empowers businesses to develop products that serve the circular economy objectives by being more environmentally friendly, reusable, durable, recyclable, and, more importantly, profitable (Ertz et al., 2022).Industry 4.0 delivers the CMP function by improving value network-wide collaboration on green product development, promoting design thinking, integrating cleaner production technologies, innovating product packaging processes, and managing product end-of-life (Mubarik et al., 2021;Saniuk et al., 2020a).CMP further involves the smartification of products and underlying services using IoT, IoS, cloud platforms, and AI.Smart products can be advantageous to companies, customers, and the environment, as they offer important opportunities for energy efficiency, consumption optimisation, end-of-life recovery, producerconsumer integration, product accessibility, and customer satisfaction (Bigerna et al., 2021a, b;Sallati & Schützer, 2021).Hence, CMP offers essential implications for socioenvironmental sustainability concerns such as environmental degradation, pollution, and customer satisfaction or rights (Dev et al., 2020).

Human Centred Technology Development (HTD)
This function involves developing technological products that prioritise human needs and interests (Ahmed et al., 2021).
Human-cantered technological products can take any form, such as applications, industrial machinery, manufacturing equipment, business intelligence system, websites, or consumer electronics (Pacaux-Lemoine et al., 2017).The HTD function promotes users' or consumers' rights, such as accessibility, privacy, or dignity (Reiman et al., 2021;Xu et al., 2021).Integrability, innovation, and virtualisation features of Industry 4.0 technologies allow businesses to understand and address users' or consumers' preferences, such as interface, skill intensity, expectations, or values (Ghobakhloo and Fathi, 2020).HTD has various implications for social sustainability concerns, such as job complexity, job security, skill gap, job displacement, customer dissatisfaction, or product accessibility (de Assis Dornelles et al., 2022).HTD also promotes the human-centricity of business operations and enhances labour productivity (Rosin et al., 2020).In particular, HTD empowers the gradual transition of manual labour to decision-makers or problem-solvers by supplying them with visualised information in real-time, along with the automation of exhausting and unergonomic tasks (Longo et al., 2017).To do so, Industry 4.0 facilitates integrating the human workforce into the hyperconnected business ecosystem (Ghobakhloo et al., 2021b).For example, industrial smart wearables such as bio-inspired protective gears would allow the human workforce to perform their tasks safer, faster, and more productively (de Assis Dornelles et al., 2022).ETA's contribution to sustainability involves promoting the users' safety, dignity, productivity, and satisfaction, to name a few (Badri et al., 2018;Rainnie & Dean, 2020).

Operational and Resource Efficiency (ORE)
This function is bi-dimensional.It first entails drawing on Industry 4.0 technologies and design principles to improve an organisation's output-to-input ratio and increase profitability by reducing operating costs (Rosin et al., 2021).Industry 4.0 delivers this dimension of ORE via various interrelated micro-processes.For example, virtualisation, empowered by AI, augmented reality, and digital twin technology under Industry 4.0, can boost OPE via improved financial decision processes, risk assessment acceleration, or higher system reliability (Ante, 2021).Automating repetitive tasks, effective human resource management, and improved knowledge sharing are other contributions of Industry 4.0 to operational efficiency (Margherita & Braccini, 2020).Second, Industry 4.0 improves resource efficiency by promoting technologies and business processes that favour resource productivity (Chen et al., 2021).For example, Industry 4.0 supports lean manufacturing by facilitating the continuous real-time monitoring of production operations (Reyes et al., 2021).Alternatively, Industry 4.0 technologies such as 3D printing or digital twins are crucial to implementing resource-efficient production concepts such as near-net shape or zero waste manufacturing (Ante, 2021;Kerin & Pham, 2019).Viewed holistically, Industry 4.0 allows manufacturing chains to take the life-cycle approach to introduce resource efficiency to value-creating operations, from raw material extraction and processing to product manufacturing, distribution, and consumption (Ertz et al., 2022).ORE implications for sustainability are myriad, ranging from resource consumption microefficiencies, human resource productivity, product quality, and industrial waste reduction to preventing environmental degradation (Mastos et al., 2021;Yilmaz et al., 2022).
Proactive Environmentalism (PRE) Industry 4.0 delivers PRE by introducing sustainability thinking into the value networks (Dev et al., 2020;Ertz et al., 2022).Through PRE, manufacturing chains can benefit from Industry 4.0 technologies to develop cleaner production systems and operations (Ching et al., 2022).PRE can also promote eco-consumerism by allowing smart consumers to understand and control the environmental impact of their consumption behaviour (Saniuk et al., 2020b).The PRE function draws on the integrability and data interoperability features of Industry 4.0 technology to allow value partners to integrate sustainable decision-making and meaningfully scale up a circular economy (Rajput & Singh, 2020).This function also involves enabling industrial value networks to integrate green materials and renewable energy sources into value engineering and creating processes to benefit all stakeholders from the desirable economic and socio-environmental outcomes (Scharl & Praktiknjo, 2019).Industry 4.0 delivers this functionality via several mechanisms, such as facilitating green innovation capability, decentralised decision systems, smarter energy management systems, and energy supply chain digitalisation (Ghobakhloo & Fathi, 2021).More importantly, Industry 4.0 enables the autonomous and continuous monitoring of sustainable procurement practices to promote the sustainable sourcing of raw materials (Lim et al., 2021).Climate protection, environmental degradation prevention, supply chain-wide circularity, and renewable integration are among the sustainability outcomes of PRE (Cheng et al., 2021).
Process Automation and Integration (PAI) Industry 4.0 draws on AI, blockchain, CPS, industrial robots, control systems, and IIoT to integrate and automate intricate business processes (Margherita & Braccini, 2021).Under the smart factory concept, PAI involves the vertical integration of production modules and automating production lines and intralogistics operations using various technologies such as autonomous collaborative robots, automated guided vehicles, control systems, edge computing, IIoT, and execution systems (Vlachos et al., 2021).PAI also offers important implications for supply chain management automation, such as enabling Autonomous Storage and Retrieval Systems (ASRS) or blockchain-driven smart contracts (Viriyasitavat et al., 2020;Sun et al., 2022).Due to the horizontal integration principle of Industry 4.0, PAI implications extend to customer relationship management automation, including autonomous customer communication via AI-driven chatbots or customer demand forecasting via predictive analytics and business intelligence software (Libai et al., 2020).PAI can promote sustainability in numerous ways, such as supply chain productivity or material flow efficiency (Fatorachian & Kazemi, 2021).

Real-Time Communication (RTC)
Real-time capability is among the integral principles of Industry 4.0 (Longo et al., 2022).The RTC function addresses the immediacy requirement of the contemporary business environment (Robert et al., 2022) (Bag et al., 2021a;Ghobakhloo, 2020).
Supply Chain Antifragility Capability (SCA) Industry 4.0 delivers the SCA function in two major ways.First, Industry 4.0 improves supply chain responsiveness by allowing supply partners to enhance their agility, adaptability, resilience, and improvision capabilities (Aslam et al., 2018;Eslami et al., 2021).For example, the analytical and decentralisation capabilities of Industry 4.0, thanks to AI, big data analytics, CPS, and digital twin technologies, allow supply partners to engage in collaborative forecasting, identify weak supply chain links, build early risk detection capabilities, and achieve supply chain-wide openness to change, conditions that promote responsiveness (Gebhardt et al., 2021).Alternatively, SCA enhances the dynamism of supply chains by enabling its functional prerequisites, such as supply chain flexibility and knowledge management (Gupta et al., 2020).By doing so, Industry 4.0 empowers supply partners to gain the agility and innovativeness to implement dynamic business models that support servitisation, nearshoring, strategic adaptability, and threat conversion capabilities (Bag et al., 2021b;Ivanov et al., 2022).The literature acknowledges that SCA manifested in the dynamism and responsiveness of the supply chain is beneficial to the economic resilience aspect of sustainability at the micro and meso analysis levels (Ivanov, 2020;Kazancoglu et al., 2022).
Sustainable Business Model Innovation (SBI) Industry 4.0 allows businesses to apply disruptive technologies such as AI, big data, or IoT to innovate various aspects of their business model, such as value streams or customer relationships (Frank et al., 2019a, b).Businesses can also draw on Industry 4.0 to reinvent their business model entirely into new value-creation systems such as manufacturing-as-a-service (Ching et al., 2022).By doing so, companies can introduce sustainable innovation into their product or processes and stay relevant in the fast-evolving business environment (Hahn, 2020).To introduce sustainability into the business model innovation, Industry 4.0 promotes businesses' sustainable product and process innovation capabilities through a complex mechanism (Mubarak et al., 2021).Such a mechanism can be idiosyncratic to each business context yet commonly involves businesses drawing on Industry 4.0 to promote sustainable collaboration, green absorptive capacity, sustainable talent management, and sustainable innovation orientation (Ghobakhloo et al., 2021a;Liu & De Giovanni, 2019).

Data Gathering and Scenario Analysis
A novel, hesitant fuzzy ISM-MICMAC approach has been used to further discuss the extracted functions of Industry 4.0.To implement the design method, experts' opinion has been used for further investigations.Detailed expert identification and selection procedures were designed and implemented to ensure the reliability of experts' insights.Only European experts were targeted for this study for two major reasons.First, the present study was funded by a European project under the Horizon 2020 Research and Innovation Programme, which encouraged a European perspective on the topic.Second, Europe is the birthplace of the concepts of Industry 4.0 and Industry 5.0, and the consortia involved in this project mainly consisted of European universities and research institutes.Accordingly, a list of 21 highly experienced experts was identified through close collaboration with the consortia partners.A self-assessment questionnaire was designed and distributed among the experts to evaluate and ensure individual experts' knowledge for participating in the study.This questionnaire measured experts' familiarity with Industry 4.0 and sustainability as well as their real-world experience concerning these concepts.As a result, according to the capabilities and accessibility, ten experts were shortlisted to participate in this research and to complete the questionnaires.The experts' profiles are presented in Table 2.A briefing session was set for each expert for 30 min to explain the research objectives and the guidelines for completing the questionnaire (Appendix).The Hesitant Fuzzy ISM-MICMAC questionnaire is a square matrix that includes all Industry 4.0 functions in rows and columns.In each cell, the experts should respond to three questions: (i) what is the impact of function (i) on function (j)? (ii) how much is the impact possible?and (iii) how much is the impact impossible?For the first question, and according to ISM-MICMAC methodology, four options were designed and presented in Table 3.
For the second and third questions, five linguistic terms were used to determine the possibility and impossibility of each impact of function (i) over function (j) (Razavi Hajiagha et al., 2022a, b).These terms and their corresponding values are presented in Table 4 (Yalcin et al., 2020).Note that the summation of possibility and impossibility value of each cell should not exceed 1 (Dolatabad et al., 2022).
The described questionnaire was sent to each expert and was completed and gathered from all after seven weeks.Next, to analyse the completed hesitant fuzzy questionnaires, the authors designed three scenarios as follows.
• Scenario 1 (Gentle).This scenario is helpful for predictable uncertain conditions.Hence, an expert opinion is acceptable if the difference between possibility from impossibility is a positive value.Otherwise, the expert opinion is changed to the inverse value (i.e., "X" is replaced by "O," and "V" is replaced by "A" and vice versa).• Scenario 2 (Moderate).This scenario is appropriate for moderate uncertain conditions.Hence, an expert opinion is acceptable if the possibility value is more than 50%, regardless of the impossibility value.Otherwise, the expert opinion is changed to the inverse value.• Scenario 3 (Strict).This scenario applies to extremely uncertain conditions.Hence, an expert opinion is acceptable if the difference between possibility from impossibility is more than 50%.Otherwise, the expert opinion is changed to the inverse value.

Hesitant Fuzzy ISM-MICMAC
After extracting the functions of sustainable Industry 4.0 and data gathering and scenario design, the questionnaire is all completed for further investigation.Thus, the HF-ISM-MICMAC approach is implemented to classify the functions in three scenarios and illustrate a level-based conceptual model to demonstrate the relationship between functions.The preliminaries and definitions required for this section are described as follows.
It is widespread and reasonable for participants to employ linguistic terms to share their experience and intuition and decide on the extracted functions' importance accordingly.In most cases, uncertainty occurs when the weight of a function or element, the importance of the expert's opinions, and the value of variables are stated with linguistic terms (Razavi Hajiagha et al., 2022a, b).Cognitive concepts are assumed and supposed as an approach to deal with this issue.This often happens when the element is subjective or limited numerical data exists.Uncertainty undeniably impacts the decision-making process; hence, it should be considered in this research (Mushtaq et al., 2011).For decades, fuzzy sets and their developments have been applied as a suitable approach to consider uncertainty and ambiguity, where each approach studies uncertainty differently (Amoozad Mahdiraji et al., 2023).Zadeh introduced fuzzy sets to deal with uncertainty in 1965.Since then, numerous developments of fuzzy sets have been illustrated, such as intuitionistic fuzzy sets (Atanassov, 1986), type 2 fuzzy sets (Rickard et al., 2008), and z-numbers (Zadeh, 2011).Hesitant fuzzy sets were designed in 2009 (Torra & Narukawa, 2009) to solve the problem of determining the membership of an element in the case that there is doubt, as illustrated by two experts.In this article, three scenarios of uncertainty, including extremely uncertain (strict), moderate uncertain (moderate) and predictable uncertain (gentle), were designed and adopted to investigate the extracted functions (described in Section 3.2).Hence, hesitant fuzzy sets and values (as described in Table 4) were necessary to consider the uncertainty of the environment and embed the experts' intuition and experience during the evaluation of functions in different scenarios.Two basic definitions for hesitant sets are as follows.
Definition 1.Let X be a reference set, a hesitant fuzzy set on X is defined in the term of a function h that returns a subset of [0, 1] when applied to X. Definition 2. Let be a hesitant fuzzy set, the lower bound, upper bound, and complement of is defined as Eqs. 1 to 3.

Interpretive Structural Modelling
ISM is one of the methods for analysing the relationships between elements, classifying them, and designing a levelbased conceptual model.This method is popular among scholars and has been widely employed (Hashemi et al., 2022).In tackling complex problems, ISM-MICMAC has emerged as a leading tool, offering several distinct advantages over comparable methodologies.Research has shown that ISM-MICMAC is versatile and flexible, providing researchers with a comprehensive framework for analysing complex systems and making better decisions.(Jafari-Sadeghi et al., 2021).In this methodology, complex systems are broken down into smaller subsystems.A multilevel structural model enables individuals and groups to understand the relationships that underlie difficult situations (Iqbal et al., 2023).It then uses the experts' practical expertise and knowledge to map the many elements of a given case.By using ISM-MICMAC, it is possible to understand the interaction of each system component within a broader context by breaking it down into smaller subsystems.The ISM-MICMAC methodology offers a significant benefit in that it enables the examination of both direct and indirect interrelationships between variables, thereby facilitating the {1 − }  analysis of the dynamic impact of various elements (Khaba et al., 2021).Traditional ISM considers only binary digits to indicate whether variables are connected.Consequently, it did not capture the strength of the relationship between the functions and cannot investigate different scenarios in ambiguous environments.The Hesitant Fuzzy ISM-MIC-MAC methodology addresses this problem.This approach facilitates a more comprehensive comprehension of the interrelationships between variables (Mahdiraji et al., 2021).
Existing studies have demonstrated its potential for analysing complex systems and identifying the most critical factors in various cases.
Step 1.A structural self-interaction matrix is formed by employing experts' opinions.In this regard, each expert determines the pairwise relationship between the functions i and function j, found in the expressions presented in Table 3.Here, three rules of scenarios designed in stage 2 should be applied to determine the value of each cell.
Step 2. The initial reachability matrix is designed based on the expressions of Table 3 and scenario rules.Therefore, for X and V, the value of one, and for A and O, zero was replaced for each expert (Iqbal et al., 2021).Then the average amount of each cell amongst the experts was (by arithmetic mean), and an integrated matrix was extracted.If the arithmetic means the value was greater than or equal to 0.7, then the value of one was used; otherwise, zero.
Step 3. Transitivity Check.The general rule is that if function i leads to j and function j leads to k, then function i leads to k.This rule should be tested for all possible situations, and the value of 1* should be replaced for all zero values if this rule applies (Jafari-Sadeghi et al., 2021).The result is known as the final reachability matrix.This step is important to reinforce the conceptual coherence of the initial reachability matrix and fill any gaps between the functions.
Step 4. Equations ( 4) and ( 5) computed the driving and dependence power of each function.
Notice that in Eqs. ( 4) and ( 5), r ij is the impact (zero or one) of function i on function j.In addition, n is the total number of functions (nine in this research).
Step 5. Next to the formation of the final reachability matrix (FRM), designing a level-based conceptual model that presents the relationship amongst the Industry 4.0 functions was considered.Hence, for each function, the (4) outputs (values of one in the row) are known as the reachability set, inputs (values of one in the column) are known as an antecedent set, and the intersection sets (values of one in both columns and row) are specified.Then, in each level, functions with equal intersection and antecedent sets were excluded from the analysis and considered a level.The same logic is repeated for all other functions (Jafari-Sadeghi et al., 2021).Accordingly, the level-based conceptual model of the functions was designed.

MICMAC Analysis
ISM is mainly used in conjunction with a criterion analysis technique called MICMAC.This analysis was presented in 1973 by Dugreen and Goodet.The purpose of this analysis is to categorise the criteria based on their effectiveness into four categories of elements, including (i) autonomous (low driving and dependence power), (ii) drivers (high driving and low dependence power), (iii) dependent (low driving and high dependence power), and (iv) linkage (high driving and dependence power) according to Eqs. ( 4) and ( 5) (Dhir & Dhir, 2020).

Results
The results were achieved by implementing the research method on the gathered data.Hence, according to the scenarios in Section 3, three classifications of Industry 4.0 functions and three level-based conceptual models were extracted.First, by applying the three scenarios on the completed questionnaires and measuring the arithmetic mean of the cells, the initial reachability matrices of all three scenarios resulted in Table 5. Next, by applying the transitivity analysis (step 3, stage 3) and measuring the driving and dependence power via Eqs.( 4) and (5) (step 4, stage 3), the final reachability matrix for each scenario emanates as Table 6.
By applying the results of Table 6 in the MICMAC analysis, the classified versions of the Industry 4.0 functions are presented in Fig. 5 (x-array driving power and y-array dependence power).This classification illustrates the (i) autonomous (low driving and dependence power), (ii) drivers (high driving and low dependence power), (iii) dependent (low driving and high dependence power), and (iv) linkage (high driving and dependence power) functions studied in this research in three scenarios.
After classifying the Industry 4.0 sustainability functions, using ISM methodology step 5, all functions were levelled in each scenario, and a conceptual framework was emanated.The results are demonstrated in Fig. 6.Remark that, for the gentle scenario, only two levels were engendered, including F 7 as the driver and first level, and the rest  of the functions as the second level.Hence, this scenario is not presented in Fig. 6.

Discussion
The present study identified nine functions through which Industry 4.0 if appropriately governed, can contribute to the sustainability objectives of the emerging Industry 5.0 agenda.These nine functions were identified as business risk monitoring and management (BRM), human-centred technology development (HTD), operational and resource efficiency (ORE), process automation and integration (PAI), proactive environmentalism (PRE), real-time communication (RTC), sustainable business model innovation (SBI), supply chain antifragility capability (SCA), and smart circular products (SCP).A novel HF-ISM approach was developed and implemented to identify the underlying mechanism for the contribution of Industry 4.0 to sustainability via these functions and under real-world circumstances.The application of these functions identified three scenarios that uniquely define how the sustainability functions of Industry 4.0 may interact under a specific business circumstance.
Scenario 1 concerned a real-world business environment with predictable uncertainty, and experts could confidently and accurately predict the existing environmental uncertainties.Under this scenario, SBI acts as the most driving function, simultaneously empowering the other eight functions of Industry 4.0 to interact and contribute to the sustainability goals of Industry 5.0.This scenario takes the innovation capabilities of Industry 4.0 for granted, postulating that Industry 4.0 and the industrial application of its digital technologies autonomously and inherently empower sustainable innovation.Under this scenario, SBI allows the other eight functions of Industry 4.0 to be developed and capitalised on simultaneously to promote sustainability objectives synergistically.While the enabling role of digitally empowered sustainable business model innovation for functions such as ORE and SCP is well documented within the literature (e.g., Fernando et al., 2019), this scenario contradicts the recent findings regarding the sustainable innovation mechanism and sustainability performance of Industry 4.0.Indeed, this scenario contradicts Ghobakhloo et al.'s (2021a) findings, which demonstrated that sustainable innovation capability is among the most hard-to-develop benefits of Industry 4.0 that depends on various digitally-enabled sustainability functions such as green absorptive capacity, sustainable innovation orientation, and inter-functional collaboration.We consider scenario one the least feasible since the contemporary business world is constantly challenged by ever-increasing disorders such as socio-political conflicts, generational changes, and data commoditisation.
We acknowledge that sustainable innovation can be recognised as one of the core design principles of Industry 4.0 under an ideally deterministic business environment.Nonetheless, firms' motive for adopting Industry 4.0 technologies mainly concerns functions that boost corporate survivability under turbulent business environments.It means scenario 1, emphasising the predominating role of the SBI, is more likely to lack applicability to the turbulence and unpredictability of today's business world.Scenario 2 concerns the implications of Industry 4.0 for the sustainability goals of Industry 5.0 in a business environment where uncertainty is somewhat unpredictable, and experts can cautiously predict the existing environmental uncertainties.Under this scenario, Industry 4.0 contribution   Scenario 3 concerns the business environment in which uncertainty is very unpredictable, and experts cannot make accurate and confident predictions of the existing environmental uncertainties.We believe that scenario 3 is the most realistic at the time of this study, considering the ongoing war in Ukraine, the energy crisis in Europe, and the lingering disruption effect of the COVID-19 pandemic.Under this scenario, Industry 4.0 contribution to the sustainability objectives of the Industry 5.0 agenda first entails integrating and automating business processes via the PAI function.The benefits and integration capabilities gained from PAI allow businesses to develop smart products that empower circular manufacturing by integrating customers and enhancing product life cycle management (the SCP function).SCP, in turn, empowers businesses to develop and implement proactive environmental strategies (the PRE function) by providing a bird's-eye view of product life-cycle and consumer behaviour.The interpretive model for scenario 3 reveals that under the unpredictability of environmental uncertainties, PRE is a prerequisite to developing real-time capabilities.This observation challenges the mainstream literature widely proposing that RTC is a technical function that is mainly empowered by decentralisation or interoperability features (e.g., O'Donovan et al., 2019).This unorthodox observation implies that when severe unpredictability applies, developing real-time capabilities in the business environment relies on firms' ability to develop forward-thinking strategic behaviour in proactively dealing with emerging uncertainties.Under scenario 3, RTC is the critical enabler of business risk monitoring and management capabilities (BRM).The implications of RTC for BRM may involve higher supply network visibility or real-time identification of risk factors.Despite the considerable dependence power of BRM, this function plays a critical driving role under scenario 3, as it directly facilitates business antifragility, technologic human-centricity, and industrial efficiency (the HTD, ORE, and SCA functions).In this scenario, SBI is the most hard-to-develop function of Industry 4.0, relying on the synergistic complementarities among HTD, ORE, and SCA.
Scenario 3 fundamentally challenges scenario 2, demonstrating that Industry 4.0 does not inherently favour sustainable business innovation under unpredictable uncertainties.To put it differently, process automation and achieving vertical and horizontal integration are the primary reasons businesses operating in volatile and unpredictable environments commit to Industry 4.0 digital transformation.This observation is somewhat expected, given that businesses need to automate their processes, integrate with stakeholders, build risk management capabilities, and enjoy resource efficiency to have the liberty to innovate their business models sustainably under unpredictable uncertainties.
The present study adopted a business-oriented perspective to explore the potential that purposeful governance of Industry 4.0 could provide for sustainability.While acknowledging the crucial role of business partners in achieving the sustainability objectives of Industry 5.0, we also recognised the insights from a recent study by Ghobakhloo et al. (2023a) that highlighted the significance of stakeholders, including governments and social actors, in guiding Industry 4.0 towards the sustainability goals of Industry 5.0.However, it is essential to note that the scope of the present study primarily focused on investigating the critical enabling role of businesses within this ecosystem.Our findings complement the recent work by Ghobakhloo et al. (2023a), as they shed light on the extensive scope of Industry 4.0 governance that extends beyond the realm of businesses alone.While Ghobakhloo et al. emphasised the importance of various stakeholders in steering Industry 4.0 towards sustainability, our study provides additional insights that further elucidate the multifaceted nature of governance within the Industry 4.0 landscape.

Implications
The present study addressed the knowledge gaps concerning the transformation from Industry 4.0 to Industry 5.0.The study strived to explain why Industry 5.0 is being rushed in such an unprecedented manner and how the ongoing digital industrial transformation known as Industry 4.0 should be managed to fulfil the sustainability objective of the Industry 5.0 agenda.To this purpose, the study implemented a unique methodology that involved the content-centric evidence synthesis of the literature and the development of a novel HF-ISM approach.The results are believed to provide important contributions to knowledge and practice.These implications are concisely discussed in the following.

Theoretical Implications
The results of the content-centric literature review reveal that Industry 4.0's contributions to sustainability are controversial.Industry 4.0 is a technology-push and productivity-driven phenomenon.As expected, Industry 4.0 implications for micro and meso economic sustainability have been dominantly positive, meaning digital industrial transformation under Industry 4.0 has led to substantial productivity improvement at the corporate and supply network levels.In rare cases, the negative impact of Industry 4.0 on the economic pillar of sustainability has been reported within the literature.Nonetheless, negative impacts have been mostly identified as temporary and rooted in the disruption caused by the implementation of Industry 4.0 disruptive technologies.Similarly, results imply that the micro and meso environmental sustainability implications of Industry 4.0 have been dominantly reported as positive.Indeed, the literature has identified various techno-functional principles of Industry 4.0 that improve energy consumption, waste aversion, circularity, emission reduction, and green innovation at the corporate and supply network levels.Conversely, the implication of Industry 4.0 for micro and meso-social sustainability is controversial and inconclusive.For example, the literature offers mixed results regarding how Industry 4.0 technologies impact job complexity.In addition, while Industry 4.0 has enhanced job safety or customer satisfaction, it has been dominantly detrimental to employee privacy, job security, and job displacement.Scholars justify these controversies by arguing that none of the technologies or principles of Industry 4.0 has been pushed by or designed for social values.
The results further reveal that the macro sustainability impacts of Industry 4.0 are understudied and inconclusive.
While Industry 4.0 offers positive implications for innovation growth and digital literacy, it has largely been detrimental to equitable macro-regional economic development, social equality, rebound effect, and job polarisation.Overall, our findings imply that Industry 4.0 has not been instrumental in addressing many of the long-lasting sustainability concerns.Many critical socio-economic sustainability concerns have been intensified due to the radical and somewhat unregulated emergence of Industry 4.0 disruptive technologies.We believe these findings adequately explain why the Industry 5.0 agenda is being pulled by socio-political bodies such as the European Commission.It is imperative to note that contemporary literature struggles with recognising Industry 5.0 as a new technology-driven industrial revolution superseding Industry 4.0.As a socio-politically pushed agenda, Industry 5.0 emphasises the role of collective and stakeholder-cantered governance of digital industrial transformation pushed by Industry 4.0.This agenda proposes that corporations and social actors should collaboratively govern and regulate Industry 4.0 transformation to ensure that socio-environmental goals are valued as highly as industrial productivity.Consistently, our findings reveal that underlying technologies and design principles of Industry 4.0 do not intrinsically contradict social values.Nevertheless, the profit-centred digital transformation management under Industry 4.0 has adversely impacted the environment and society during the past decade.In addition, our literature review has unveiled a noteworthy trend where recent studies leverage the disruptive emergence of generative artificial intelligence within the scope of Industry 5.0 to suggest that Industry 5.0 might constitute the next wave of the industrial revolution.In light of this, our study underscores the perspective that Industry 5.0 should be recognized as a socio-technological transformation framework.Indeed, the Industry 5.0 framework involves the responsible utilization of emerging Industry 4.0 technologies to integrate societal values into companies' digital transformation strategies.
Accordingly, our literature synthesis identified various functions through which the responsible utilization of Industry 4.0 technologies can potentially promote the sustainability values of Industry 5.0.Each of the functions identified offers narrow implications for a few specific aspects of Industry 5.0 sustainability goals.For example, the PAI function of Industry 4.0 has been consistently reported to promote the waste reduction, resource consumption efficiency, and business resilience aspects of sustainability.Building on the consensus that 'if governed appropriately, Industry 4.0 can promote the sustainability values prioritised under the Industry 5.0 agenda,' we developed and implemented a novel HF-ISM approach that identified how the sustainability functions of Industry 4.0 should contextually interact to fulfil Industry 5.0's sustainability values.
Finally, the study contributes to the literature by revealing that while Industry 5.0 sets ambitious sustainability goals, the methods to achieve them are largely unclear.Findings showed that Industry 5.0 builds upon the technologies and principles established in Industry 4.0.Consequently, companies can strategically harness the sustainability features embedded in Industry 4.0 to contribute to the societal objectives of Industry 5.0 systematically.This insight enhances our understanding of how Industry 4.0 technologies and principles can be methodically applied to bridge the gap between sustainability aspirations and the practical implementation of the Industry 5.0 framework.

Practical Implications
Our HF-ISM approach identified three scenarios under which the sequential interaction of the sustainability functions of Industry 4.0 differs significantly.In a less turbulent environment where uncertainties are precisely predictable, Industry 4.0 inherently allows organisations to introduce innovation into their business model sustainably, allowing other sustainability functions of Industry 4.0 to flourish collectively.As unanimously emphasised by the expert panel, this scenario is naively optimistic and may lack applicability to the realities of the turbulent business world.Indeed, scenario one would be most applicable to businesses operating in mature industries, particularly older and stable mega corporations that have the necessary resources to leverage the business innovation opportunities of Industry 4.0 to enable and capitalise on other sustainability functions simultaneously.
Under scenario two, where uncertainties of the business environment are reasonably predictable, Industry 4.0 stakeholders should strive to leverage BRM, SBI, and SCP functions simultaneously to introduce innovation into business models sustainably, promote smart products that support circularity, and monitor the associated processes and risks.These functions will further empower businesses to proactively implement sustainability strategies and enjoy higher operational and resource efficiency.Under moderate business uncertainties in this scenario, real-time communication capability (RTC function) is moderately imperative yet critical for enabling process automation and integration.Under scenario 2, human-centric technology development and supply chain agility are dependent functions and should be leveraged when other enabling sustainability functions of Industry 4.0 are already in place.Therefore, this scenario assumes that antifragility and human-centricity may not be critical to other sustainability functions and can be considered the most remote and less critical (in terms of relational importance) sustainability outcomes of Industry 4.0.
Under the third scenario, we identified how Industry 4.0 could best serve the sustainability values of Industry 5.0 under an extremely turbulent environment where uncertainties are highly unpredictable.Under such circumstances, businesses should first leverage the automation and integration capabilities of Industry 4.0 to strengthen their competitive position via higher cost savings and productivity.Industry 4.0 stakeholders should draw on the SCP function to develop and integrate smart products that facilitate circularity by drawing on the integration capabilities gained from the PAI function.This sequence of leveraging Industry 4.0 functions should continue by implementing more proactive environmental strategies and drawing on Industry 4.0 technologies and capabilities that support real-time communication within the business network.Under extreme uncertainties, real-time communication capability is indispensable to the business process and risk monitoring function of Industry 4.0, given that changes and disruptions in the internal and external business environment could happen unexpectedly.Scenario 3 emphasises the crucial role of BRM, introducing this function as the critical requirement for HTD, ORE, and SCA functions of Industry 4.0.These three functions are co-dependent under highly unpredictable uncertainties, and Industry 4.0 stakeholders should strive to synergistically leverage the human-centric technology development, antifragility, and industrial efficiency functions of Industry 4.0.Adhering to this sequence would eventually empower businesses to effectively benefit from the sustainable innovation capabilities of Industry 4.0 to innovate their business model in line with the sustainability values of Industry 5.0.We believe scenario 3 to be more realistic for businesses operating under a highly turbulent environment, particularly businesses impacted by regional conflicts like the Russian invasion of Ukraine.
Overall, the findings of our study have significant implications for organisations aiming to leverage Industry 4.0 to enhance their sustainability efforts.While the identified scenarios shed light on the sequential interaction of sustainability functions, providing actionable pointers on how businesses can effectively capitalise on these functions is crucial.The following offers specific guidance for managers to consider when devising digitalisation governance strategies in various environmental contexts: For scenario one and under Less Turbulent Environment with Predictable Uncertainties, an opportunity exists for businesses in mature industries, particularly older and stable mega-corporations, to introduce sustainable innovation into business models using disruptive technological constituents of Industry 4.0 such as digital twin and AI.To fully leverage this potential, organisations should focus on the following actionable pointers: • Allocate necessary resources to capitalise on business innovation opportunities presented by Industry 4.0 technologies.
• Simultaneously enable and capitalise on other sustainability functions to maximise the collective impact.• Consider the specific needs and capabilities of the organisation in leveraging sustainability outcomes.
For scenario two and under a Moderately Predictable Business Environment where uncertainties are reasonably predictable, organisations should strive to simultaneously leverage the BRM, SBI, SCP, and RTC and consider the following actionable pointers consecutively: • Emphasise sustainable innovation in business models by integrating BRM, SBI, and SCP functions.• Promote circularity by developing and integrating smart products while monitoring associated processes and risks.• Leverage RTC capabilities to enable process automation and integration, focusing on operational and resource efficiency.• Prioritise human-centric technology development and supply chain agility in alignment with other sustainability functions.
For scenario three and under a Highly Turbulent Environment with Unpredictable Uncertainties, organisations operating in extremely uncertain contexts should prioritise strengthening their competitive position through cost savings and productivity gains by leveraging the automation and integration capabilities of Industry 4.0.To effectively navigate such turbulent environments, managers should consider the following actionable pointers: • Utilise the PAI function to integrate and automate business processes, enhancing competitiveness.• Develop and integrate smart products that support circularity using the SCP function.• Implement proactive environmental strategies and leverage real-time communication capabilities to monitor and respond to unexpected changes and disruptions.• Establish BRM as a critical requirement for HTD, ORE, and SCA functions to maximise their synergistic effects.
Managers should note that the three scenarios can be equally applicable depending on the firm's internal environment (e.g., culture, processes, resources) and external environment (e.g., regions' socio-political and economic circumstances).It is vital for managers to also bear in mind that the driving and dependence power of these functions and their placement levels within the interpretive models of the scenarios do not reflect their absolute importance concerning the sustainability values of Industry 5.0.The sequential orders identified within the scenarios merely reflect the precedence relationships that might exist within the functions.
Under a given scenario, the sequential order for leveraging the functions is expected to maximise the synergistic values of the functions for sustainability objectives.Regardless of the scenarios, each identified function uniquely promotes some aspects of Industry 5.0 sustainability values.Hence, none of these functions and their enabling role can be overlooked while devising Industry 4.0 governance strategies.

Conclusion
The present study addresses the existing knowledge gaps surrounding the transition from Industry 4.0 to Industry 5.0 while focusing on sustainability values.The findings highlight the controversial nature of Industry 4.0's contributions to sustainability.The study emphasises the importance of collective governance and regulation to prioritise socio-environmental goals alongside industrial productivity.Moreover, the novel HF-ISM approach developed in this study identifies distinct scenarios for effectively leveraging the sustainability functions of Industry 4.0 to align with the sustainability values of Industry 5.0 in different levels of environmental uncertainties.Nonetheless, the results should be interpreted in light of the study's limitations.

Limitations and Future Directions
Despite our efforts to ensure the reliability and inclusivity of our findings, the present study inevitably faces some limitations that future studies can address.Scholars believe that Industry 4.0 is dynamic and far from its full potential.Likewise, the Industry 5.0 agenda is embryonic and expected to evolve significantly in the future.It means the sustainability values of Industry 5.0 will expectedly evolve, and the functionality of Industry 4.0 to satisfy these values may change accordingly.Therefore, our methodology and the novel HF-ISM approach can be used as a baseline for future studies to evaluate the sustainability implications of Industry 4.0 in the future and under various business scenarios with varying predictability of uncertainties.
The second limitation of this study concerns the nonprobability nature of the sample consisting of 21 experts.The purposeful selection of experts based on their expertise and experience introduces potential biases and restricts the generalisability of the findings.Caution should be exercised when extrapolating the results beyond the specific sample of experts included in this study.Future research employing probability sampling methods could enhance the representativeness of the findings and allow for broader generalisations.Despite this limitation, the study provides valuable insights within the context of the sampled experts, serving as a foundation for further research in the field.
Third, the interpretive models identified in this study merely describe the order in which the sustainability functions of Industry 4.0 should be leveraged to maximise their sustainability values synergistically.Although Industry 4.0 can offer valuable sustainability functions, these functions are complex and resource-intensive.We must acknowledge that digitalisation under Industry 4.0 does not guarantee the automatic development of these desired functions.Indeed, several industrial cases within the literature argue that using Industry 4.0 technologies to achieve operational and resource efficiency in factories is a complicated, resource-intensive, granular, and high-risk process, which may rely on several success factors such as knowledge competencies, information and operations technology readiness, change management capabilities, and technology governance competencies.Since identifying the micro-mechanisms through which Industry 4.0 can successfully deliver these sustainability functions fall outside the scope of the present work, we invite future research to identify, explore, and scrutinise these micro-mechanisms.
Furthermore, A promising avenue for future research involves integrating longitudinal studies to establish and verify causal relationships identified within the sustainability functions with greater confidence.By employing longitudinal research designs, researchers can examine the temporal dynamics and changes in the sustainability functions over the course of Industry 5.0 evolution.This approach would enable a deeper understanding of how these relationships evolve and whether they maintain their significance and strength over time.Furthermore, exploring the long-term effects and dynamics of identified causal relationships through longitudinal studies would contribute to a more comprehensive understanding of how digital industrial transformation should adhere to inclusive sustainability.
Finally and yet importantly, the sustainability functions identified within the present study may not have the inclusiveness to address all the sustainability concerns of the Industry 5.0 agenda.Indeed, some of the sustainability concerns highlighted within the Industry 5.0 agenda have nothing to do with the mismanagement of Industry 4.0.Conditions such as redefining the role of corporate responsibility, bypassing neo-liberal capitalism toward shareholder supremacy, or synchronising the public sector with the pace of change appear to be the enablers of Industry 5.0 sustainability values that fall outside the Industry 4.0 context.Therefore, we encourage future research to build on the present study as a stepping stone and integrate the sustainability functions of Industry 4.0 with other socio-political requirements to develop more comprehensive strategy roadmaps that inclusively empower all sustainability priorities of Industry 5.0.Appendix: Self-Assessment Questionnaire 1.How familiar are you with the Industry 4.0 And 5.0 frameworks proposed by the European Commission? 2. How familiar are you with the scientific and industrial background of Industry 5.0? 3. How familiar are you with the mechanisms through which Industry 4.0 can promote sustainable development?4. Please briefly explain your past collaboration with the European Commission that might somehow relate to Industry 5.0-driven sustainability.Examples may include collaboration as a principal investigator, senior researcher, or advisory board member on related topics such as technology governance, digital transformation, Industry 4.0, sustainability, digitally-driven circular economy, or resilient economy.5. How likely would it be for you to commit to identifying the pair-wise relationships among all the functions?Kindly note that filling out the questionnaire will take up to 60 min.6.How would you rate your English proficiency in understanding the technical terms in the context of the study and engaging in filling out the questionnaire?

Fig. 2
Fig. 2 Sustainability impacts of Industry 4.0 and their acknowledgement rate within the literature

Fig
Fig.4The HF-ISM research framework Abbreviation

Fig. 5 a
Fig. 5 a Classification of Industry 4.0 functions in the gentle scenario.b Classification of Industry 4.0 functions in the moderate scenario.c Classification of Industry 4.0 functions in the strict scenario

Fig. 6
Fig.6The level-based conceptual framework for the functions

Table 1
Exclusion criteria applied for resource identification

Table 2
Experts profile

Table 4
The value of each linguistic term for the Hesitant Fuzzy questionnaire

Table 5
Initial Reachability Matrix (IRM) for gentle, moderate, and strict scenarios Functions