The paper reports on experiences accumulated during a EU research project where challenges pertaining to requirements-driven metamodelling agility have been analysed. Traditionally, modelling languages are perceived as stable artefacts – that is, if they address a sufficiently large community with fixed modelling requirements on a fixed layer of abstraction. However, the enterprise modelling community must also consider the case where evolving requirements emerge in a narrow domain, or even in a single enterprise, therefore reusability across domains will be sacrificed to the benefit of on-demand adaptation, specialization or integration. Under such conditions, an agile metamodelling approach was applied in the ComVantage project and this, in turn, raised specific requirements for conceptual and technological enablers, allowing us to derive conclusions that are generalized here beyond the project scope. The paper’s concluding SWOT analysis highlights the need to stimulate the emergence of an agile metamodelling paradigm based on community-driven enablers.
- Agile modelling method engineering
- Enterprise modelling
- Modelling requirements
Diagrammatic conceptual modelling has been concerned with standardization even from its earliest days, when the first draft of “process chart” symbols  was presented to the American Society of Mechanical Engineers (ASME), with a subtitle suggesting optimality: “Process Charts – First Steps in Finding the One Best Way to Do Work”. According to the authors, the process charts were “a device for visualizing a process as means for improving it” and, for this purpose, an initial set of quite arbitrarily chosen symbols was proposed. The set of symbols was further developed by ASME in a new set of flowcharting symbols whose key quality was that they could be drawn by engineers using crayon and “template rulers”. Later, Von Neumann adopted these to describe the first programs in a control flow visualization style. Many years later, standards like UML and BPMN still inherit the rhombus shape for decision concepts (and other such “legacy symbols”) as part of standardized notations. However, computer-aided diagrammatic modelling can now benefit from enriching notation with a variety of features, such as: interactivity (symbols acting as hyperlinks), dynamics (symbols changing based on some machine-readable properties or semantics), visual semantics (information communicated through ornamental aspects, or even animation). None of these had been possible in the days of crayon and template rulers, and the variety of available options in this respect is nowadays subject to modelling requirements, together with other customization needs of the targeted users (modellers) pertaining to (i) model-driven functionality, (ii) semantic coverage of models or (iii) the depth of domain-specificity.
As software engineering recognized the unstable nature of requirements and the competitive value of flexible response to evolving requirements, the Agile Manifesto  and community emerged to challenge the traditional rigid ways of building software. Similar challenges can be met with respect to modelling requirements in the practice of modelling method engineering, particularly in its application for enterprise modelling. Consequently, an Agile Modelling Method Engineering (AMME) approach and its enablers must be consolidated from experience reports such as the one to be provided in the work at hand.
The goal of this paper is to share metamodelling experiences from our research on modelling virtual enterprises in the ComVantage research project , consequently highlighting characteristics of AMME as a key methodological necessity. In order to establish the motivation, we will introduce the improvised term “ComVantage enterprise” and compile its characteristics and challenges that must be tackled with an AMME approach. A modelling method and prototype was developed for the mentioned project within the environment provided by the Open Model Initiative Laboratory , and the paper reflects back on this development experience.
The remainder of the paper is structured as follows: Sect. 2 provides a brief project overview and, as a generalized motivation, compiles the enterprise characteristics that require an AMME approach. Section 3 provides an overview on the emerging AMME approach and its key enablers. Section 4 reports on experiences with AMME in relation to examples extracted from the ComVantage modelling method. Section 5 positions the paper in the context of related works. The final section generalizes conclusions beyond the project scope.
2 Motivational Characteristics of a “ComVantage Enterprise”
In this section we will compile characteristics for a “ComVantage enterprise” from the project experience, as well as by instantiating features identified in research roadmaps provided by European research clusters where the project took part - e.g., FInES .
The ComVantage research project aimed to support collaborative business processes in virtual enterprises with adaptive mobile technology driven by models designed with the domain-specific “ComVantage modelling method”. The modelling method had to be developed iteratively, as requirements evolved and the development of run-time systems also imposed an incremental iterative approach. Details on different snapshots of the evolving modelling method are available in deliverables  (deliverables D311, D312) and previous publications [6, 7]. In this paper we will only provide insight for a few modelling elements in order to derive key characteristics for AMME. In the following, we highlight the enterprise characteristics that must be tackled by the AMME approach:
A. Modelling is Employed as Knowledge Representation.
Historically, model-driven software engineering employed models in different ways, as highlighted by Table 1. The “modelling is programming” paradigm  uses models for generation of executable code. This vision was later complemented by a “modelling is configuration” approach, having run-time systems parameterized with model information and models acting as “control panels” to influence run-time behaviour – e.g., in the context of process-aware information systems , with the help of XML model serializations such as BPEL ). As enterprise modelling expanded beyond the goals of business process management in order to build a holistic representation of the enterprise, diagrammatic models became means of capturing the knowledge of stakeholders on different enterprise aspects (e.g. processes, goals, capabilities).
Relevance to AMME:
AMME is called to ensure that the necessary semantics is captured, in relation to modelling needs that may evolve as users become accustomed to modelling. On the side of stakeholders, inexperienced modellers will gradually raise requirements for deeper specialization of modelling concepts (deepening domain-specificity), while the modelling method engineer can be confronted with gradual understanding of the application domain.
B. Semantics-Awareness is Required for Run-Time Enterprise Systems.
The functionality of enterprise systems can be, at execution time, sensitive to machine-readable semantics captured in various forms. Typically such semantic representations are nowadays available in a new type of semantic networks (the Linked Enterprise Data paradigm ), possibly enriched by ontologies and rules to enable reasoning over the Web of Data. Alternatively, information systems may also be sensitive to the semantics captured in diagrammatic form by enterprise models (with the modelling language alphabet acting as a “terminological box”) – that is, if relevant granularity is ensured, and a machine-readable model repository is provided.
Relevance to AMME:
AMME is called to ensure that changes in requirements for the run-time enterprise system propagate accordingly to modelling requirements so that the necessary properties are assimilated in the modelling language (to become accessible at run-time).
C. Scenario-Driven Requirements for Run-Time Systems.
Means that run-time requirements should be built around work processes and work capabilities rather than around disparate use cases. While traditional requirements elicitation practices used to advocate atomization of user stories, the increasing experience of stakeholders with business process management may be leveraged in order to capture requirements in control flow representations mapped on resource/capability requirements. Agile software engineering already recognized this by aggregating requirements in narrative units such as stories and epics.
Relevance to AMME:
As  emphasizes, requirements elicitation does not produce requirements per se, but requirements representations, whose descriptions may involve domain-specific concepts and properties relative to the business context. AMME is called to provide agile modelling means for collecting enterprise system requirements that include domain-specific aspects, thus bridging the gap between stakeholders and system developers .
D. Complexity Management Challenges.
Although modelling typically means abstraction and simplification, in enterprise modelling even the model is too complex to be comprehensive in a single diagrammatic representation. Enterprise models are partitioned in different facets/layers across different abstraction layers or viewpoints (see Archimate , Zachman ). Since diagrammatic enterprise models are subjected to human interpretation, an inherent decomposition requirement must ensure model understandability and should be satisfied both on the meta level (e.g., by partitioning a metamodel in multiple model types) and on the model level (e.g., decomposing a business process model in subprocesses).
Relevance to AMME:
AMME is called to identify building blocks of manageable granularity for both modellers (to help with model comprehension) and metamodellers (to help defining backlog units). Such building blocks will make it possible to isolate evolving modelling requirements so that an agile response to changes does not affect the entire method and change propagations become traceable.
E. Domain-Specific Modelling Requirements.
Enterprise models can be specialized and contextual, and it is plausible to have an enterprise modelling method adopted in a narrow community, or even for a single case/project, where the enterprise is interested in employing models for internal purposes (e.g., as input for a custom model-aware run-time system), with no desire for sharing and reusing them in the external environment.
Relevance to AMME:
In domain-specific modelling, the level of concept specialization is not necessarily fixed, as new properties and subtyping may be gradually required to achieve new capabilities and the proverbial “competitive advantage” of agile development. AMME is called to ensure that such evolving specialization is assimilated in the method in a timely manner.
3 The AMME Framework
3.1 Framework Overview
Without going point by point through the Agile Manifesto , we highlight the key characteristics of Agile development as compiled by :
Iterative: repeat activities and potentially revisit same work products;
Incremental: each successive version is usable and builds upon previous versions;
Version control: enable for other agile practices;
Team control: small group of people assigned to the same project building block with shared accountability.
In order to achieve agility in Modelling Method Engineering, such principles must be grafted on the fundamentals of modelling method design, considering the building blocks defined in , described as follows:
The modelling language describes the set of modelling constructs (their notation, grammar and semantics. To achieve manageable granularity and model comprehensibility, the modelling language can be partitioned in model types addressing different facets or abstraction layers of the system under study. The partitioning can be perceived as a usability feature (a top-down decomposition approach to avoid visual cluttering) or a consequence of hybridization (a bottom-up strategy employed to interconnect modelling language fragments).
The modelling procedure defines the steps that must be taken by modellers towards some goal (in the simplest case, it advises on the precedence in creating different types of models).
The mechanisms and algorithms cover functionality that process model information for various purposes (visualization, transformation, evaluation etc.).
Agility relies on iterative incremental cycles integrated in a high level framework such as the one depicted in Fig. 1.
In the centre, the modelling method evolves in a Produce-Use metamodelling cycle (by analogy with the Code-Test cycle): (i) in the top phase, the modelling language is derived from so called “Models of Concepts” that capture the domain knowledge and structure it in modelling constructs (the language alphabet); (ii) in the lower phase, each iteration of the modelling method is implemented in a modelling tool that allows the creation and evaluation of enterprise models (“Models that Use Concepts”) by instantiating the concepts designed in the previous phase/For this cycle, the Application Environment raises modelling requirements and provides domain knowledge, while in the backend a Knowledge and Resource Repository accumulates reusable resources and lessons learned. In our case the Knowledge and Resource Repository is accumulated through the Open Model Initiative Laboratory, a physical and virtual research environment that also hosts an implementation of the ComVantage modelling prototype  (which still evolves in follow-up projects).
3.2 Conceptual Enablers
During the Produce phase of the cycle depicted in Fig. 1, a knowledge acquisition effort will produce a “Model of Concepts” to describe the enterprise ontologically. A practical requirement for decomposition naturally emerges in order to ensure model comprehensibility and a usable separation of concerns. The solutions that fulfil the decomposition requirement are also the basis of establishing a manageable backlog granularity during AMME, beyond the building blocks suggested in Sect. 3.1. A generic classification scheme for different kinds of units (content containers) is provided in Fig. 2.
On the Top Layer: Asemantic containers provide a grouping of modelling constructs without assigning explicit machine-readable semantics to this grouping, unlike the semantic containers which have to their content a richer relation than the generic mereological one (“part-of”/”contains”). Depending on how containers are perceived, we may have visual containers (visual partitions sectioning the modelling canvas according to some criteria, e.g. business process swimlanes) or functional containers (an entire model). With respect to how the contents of a container are related to the exterior of that container, we may have related content (through machine-readable relations) or isolated content.
On the Lower Layer: The container types are further subsumed to more specialized building blocks: for example swimlanes/pools in business process models are typically unspecified visual containers (their meaning can be left to human interpretation). However, depending on the freedom of interpretation to be allowed, the relation of a swimlane to its contents may also be prescribed at metamodel level, by imposing semantics on this containment (e.g., a machine-readable link to an organisational unit). A more complex type of container is the model type, used when the enterprise modelling language has the alphabet split into problem-specific subsets. These are semantic containers in the sense that they have a clear meta-level specification of what concepts are allowed in each type of model, as well as constrained relations (links) to other models. If such a specification does not exist, we are talking about unprescribed canvas (e.g. Powerpoint-style free sketches). Each concept in a model type becomes a semantic unit, and its properties must be traced to detect propagation of changing requirements, as will be shown in Sect. 4. Further (implementation-specific) specialization is suggested in Fig. 2, however it will not be detailed here since it depends on the intended depth of domain-specificity on a case by case basis.
3.3 Technological Enablers
Rapid prototyping is a key necessity for producing iterative prototypes that meet gradually refined requirements, even “throwaway prototypes” aimed to (i) familiarize inexperienced modellers with what they can expect from the final implementation and to (ii) stimulate their ability to formulate modelling requirements. The practice of metamodelling has answered such necessities and nowadays we see an increasing popularity of platforms that provide built-in functionality for productive development of modelling tools according to some existing conceptualisation (e.g., ADOxx , MetaEdit+ ). Each available metamodelling platforms relies on a meta2model providing primitive built-in constructs (e.g., concept, connector) to create “Models of Concepts”. As a complement to the available metamodelling platforms, specifically aimed to support rapid cross-platform prototyping, we have proposed in  an additional abstraction layer where a modelling method can be described in a declarative language (MM-DSL, Fig. 3) built on a common subset of primitives of the popular meta2models. A draft of the language grammar is openly available at . Rapid prototyping is enabled by compilers that translate MM-DSL code to a platform-specific format for the metamodelling platform of choice in order to produce modelling prototypes in a highly automated way (a proof-of-concept compiler is currently available only for ADOxx deployment, with additional compilers expected to emerge from the OMILab community).
4 AMME: The ComVantage Case
Enterprise modelling methods typically show a recurring frame of facets/layers/viewpoints and this was also adopted in the ComVantage modelling method, as its metamodel is split in various enterprise facets – the business model, business processes, app and data requirements (due to the project’s technological specificity), models of domain-specific resources. Semantic relations are present in the form of hyperlinks that allow navigability across models and at the same time characterize the semantics of how the different facets (typically covered by different model types) are related one to another. We will not discuss here the entire metamodel layering (details available in public deliverables [3, D312]), only some fragments that illustrate the modelling requirements evolution and its propagation in the method building blocks.
Since decomposition is a key enabler for agility, the modelling method building blocks must be mapped on backlog tasks and sprint responsibilities. Metamodellers are typically confronted with requirements that propagate across these building blocks, with typical situations being reflected in Fig. 4 according to the following numbering (concrete project-based examples follow in the subsequent subsection):
Requirements for (semantics-aware) run-time systems will propagate in requirements for semantics available in models;
Requirements on mechanisms and algorithms typically propagate in requirements for new properties or concepts in the language (to provide additional input to functionality);
Requirements on notation change quite often, as most users perceive modelling primarily on a visual level. Change requests on notation level typically propagate in the other building blocks, e.g.: (i) dynamic or interactive notations will depend on the presence of some property in the concept semantics; (ii) excessive visual cluttering will be solved by splitting a model type in multiple model types, also raising new integration needs (hyperlinks between models);
Requirements on a model type typically propagate in other related model types, as concepts are transferred among model types to reduce the linking effort, or new concepts are introduced;
The modelling procedure typically takes the form of modelling guidelines, therefore usually there are no direct requirements on the modelling procedure. However, users may impose requirements in the form of constraints, which are quite volatile in nature (e.g., “I don’t want to have more than 5 model types”). More importantly, such constraints refer to usability and the automation of some procedure steps (e.g., “I don’t want to create models of type X. Instead, they should be generated automatically”) and this typically propagates towards additional functionality;
Any changes in the modelling language and functionality propagate in the modelling procedure guidelines.
A core concept of the method is the App requirement concept aiming to capture, at business process level, what kinds of mobile apps are required to support specific business activities. As an app-centred run-time architecture was being developed in the project, the modelling requirements on how the “required apps” should be described evolved. Table 2 illustrates this evolution along 5 phases, while the subsequent figures reflect how the concept evolved on a diagrammatic level.
Figure 5 shows how the app requirement description evolved between Phases 1 and 2, from an editable property of a process activity to a modelling symbol with its own domain-specific editable properties (the blue boxes are mock-ups of the property sheets).
Figure 6 shows the additional model types that emerged from Phases 3 and 4 (the pool of required apps isolated from the business process model, and the abstract UI model for each app), as well as the types of links that can be created between models (see the legend). Figure 7 shows the orchestration model type emerging in Phase 5 as a necessity for exposing the app usage precedence to the run-time system (run-time orchestrated apps ). The sample model in Fig. 7 is generated automatically via a graph rewriting rule set applied on the business process model example in Fig. 6 (details on the transformation are out of this paper’s scope, being available in ).
5 Related Works
To the best of our knowledge, the framework of Agile Modelling Method Engineering was initially outlined on a generic level in some of our previous work - the published keynote  and the works of the NEMO (Next Generation Enterprise Modelling) Summer School , with some characteristics being suggested (in the context of fast prototyping) in . This paper is distinguished from the mentioned works by (a) reporting on experiences from an application case of the generic AMME framework, with respect to challenges identified in the ComVantage research project (the case discussed in Sect. 4); (b) refining the characteristics of a “Next Generation Enterprise” by anchoring them in characteristics of enterprises involved in the discussed project (Sect. 2); and (c) providing details on the conceptual and technological enablers (Sects. 3.2 and 3.3).
However, the AMME framework builds on agility challenges identified in other related works, since it emerged from a multi-disciplinary convergence of concerns previously discussed in the fields of Metamodelling and Enterprise Modelling:
Agility challenges, as well as model complexity challenges, have been discussed in the field of Metamodelling with respect to improving productivity for multi-perspective modelling , domain-specific multi-level modelling , as well as in a metamodelling interpretation on Language-oriented Programming . Metamodelling itself, as a discipline, emerged from the need to enable flexibility in modelling language design through a multi-layered abstraction architecture (e.g., the “powertype” approach , the MetaEdit+ approach ). This, however, has not been complemented yet by a fully-fledged methodological agile approach that mirrors the agility principles and challenges from software development. Project-based experiences are necessary to bring forth the kind of reflections that fuelled the agile movement in software engineering, since the Agile Manifesto mainly evolved from pragmatic needs of practitioners who questioned the obstacles and pitfalls of rigid management approaches (e.g., the waterfall approach).
The discipline of Enterprise Modelling recognizes a need for semantic as well as notational diversity, since a multitude of enterprise architectures and frameworks have been established and are widely adopted (e.g., EKD , ArchiMate , Zachman , more recently capability-driven approaches ). However, the paradigm of Enterprise Modelling traditionally obscures the notion of evolving modelling requirements which is central to AMME, as it requires dedicated management strategies. This is perhaps due to ambitions for standardization, which is in line with the original goal of ASME process charts on enabling “the best way to do work”. The work at hand aims to stimulate the assimilation of “unstable” domain-specificity (or even case-specificity) that must extend high-level enterprise architecture models in response to changing requirements.
6 Concluding SWOT Analysis
Just like the Agile Manifesto for software development, the notion of AMME is consolidated not only from theoretical analysis, but also from reflecting back on obstacles and experiences with metamodelling projects. Experiences with the ComVantage research project show a practical AMME instantiation and have been synthesized in the work at hand. Consequently, AMME is hereby analysed qualitatively as a foundational notion with an early-stage maturity level on which future work is called to further establish enablers. By paralleling the principles of Agile software development, methodological or technological enablers are expected to emerge from community-driven efforts and shared experiences: management support tools, rapid prototyping enablers, validation methodologies, reports on agile best practices or agility pitfalls. Since we are not dealing yet with a wide adoption of AMME, it is too early to assess comparative experience reports. A SWOT analysis is hereby provided to evaluate the success of AMME for the instance experience:
Strengths: AMME was a necessity for enabling the evolution of Enterprise Modelling requirements and for dealing with their multi-faceted nature, as multiple types of stakeholders have been involved, from design-time decision makers (aiming for model analysis) to run-time system users (relying on machine-readable model semantics). Conceptual and technological enablers supported the agile approach and brought forward the need for a mature agile approach to metamodeling.
Weaknesses: The experience with applying AMME is still limited to OMILab projects. Its application to ComVantage emerged as a necessity driven by unstable requirements. The main identified pitfalls are (a) that synchronicity with the development of the run-time systems relying on model information is difficult to maintain if not planned from the very beginning; and (b) an evaluation methodology for user acceptance involves a training phase that can create bottlenecks, as stakeholders are called to frequently re-learn the modelling language. In addition, aspects pertaining to the management of human resources in agile teams have not been tackled in this paper. Future works must consider strategies to tackle such challenges.
Opportunities: The evolution of the Agile software development practices and tool support was fundamentally community-driven. Future work may be layered on the conceptual foundation established by the work at hand in order to enrich AMME as a community-driven framework, to raise its maturity level, to enrich tool support and to enable longitudinal studies for further refinement.
Threats: Standards typically defuse the problems raised in the work at hand by bringing all potential users on the same level of abstraction and encouraging universal adoption for the benefit of reusability across domains. Therefore, the generalized relevance of the work at hand depends on the desired trade-off between reusability and domain specialization, as well as on the uptake of semantics-aware information systems whose evolving requirements are an inherent cause for propagating modelling requirements.
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The research leading to these results was funded by the European Community’s Seventh Framework Programme under grant agreement no. FP7-284928 ComVantage.
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Buchmann, R.A., Karagiannis, D. (2015). Agile Modelling Method Engineering: Lessons Learned in the ComVantage Research Project. In: Ralyté, J., España, S., Pastor, Ó. (eds) The Practice of Enterprise Modeling. PoEM 2015. Lecture Notes in Business Information Processing, vol 235. Springer, Cham. https://doi.org/10.1007/978-3-319-25897-3_23
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