Improving conservation practice with principles and tools from systems thinking and evaluation

Achieving nature conservation goals require grappling with ‘wicked’ problems. These intractable problems arise from the complexity and dynamism of the social–ecological systems in which they are embedded. To enhance their ability to address these problems, conservation professionals are increasingly looking to the transdisciplines of systems thinking and evaluation, which provide philosophies, theories, methods, tools and approaches that show promise for addressing intractable problems in a variety of other sectors. These transdisciplines come together especially around praxis, i.e., the process by which a theory or idea is enacted, embodied or realized. We present a review and synthesis of the learnings about praxis that have emerged from The Silwood Group, a consortium of conservation professionals, professional evaluators, and complexity and systems thinkers. The Silwood Group believes that for conservation activities to achieve ambitious goals, we should benefit nature without compromising the well-being of people, and that framing a praxis for conservation in the context of social–ecological systems will provide the greatest potential for positive impact. The learnings are presented as four key principles of a ‘praxis for effective conservation’. The four principles are: (1) attend to the whole with humility; (2) engage constructively with the values, cultures, politics, and histories of stakeholders; (3) learn through evaluative, systemic enquiry, and (4) exercise wisdom in judgement and action. We also provide descriptions and references for tools and methods to support such praxis and discuss how the thinking and approaches used by conservation professionals can be transformed to achieve greater effectiveness.


Introduction
Nature conservation initiatives typically operate in complex and dynamic social-ecological systems that necessitate grappling with 'wicked problems' (Rittel and Webber 1973). Such problems may not only be insoluble in the short-and medium-term, but may be exacerbated by negative feedbacks created when people attempt to solve them. The general failure to reverse widespread and growing pressures on nature (Butchart et al. 2015), despite substantial investment in both conservation science and practice, reflects this 'wicked' state.
Tradeoffs are increasingly accepted as necessary for conservation initiatives, which must navigate power and political relationships while attempting to simultaneously achieve conservation, development and human well-being goals. The high rates of failure amongst initiatives aiming to navigate these trade-offs, be they protected areas, Integrated Conservation and Development Projects, Biosphere Reserves or Community-Based Conservation initiatives, demonstrates the historically pervasive challenge posed by balancing the multiple values, politics and power inherent in these contexts (McShane et al. 2011). A new approach to conceptualizing and practicing conservation is urgently required.

3
Whilst the discipline of conservation aspires to be increasingly effective at grappling with wicked problems (Game et al. 2014), many conservation initiatives struggle to recognize and instill the learning processes necessary to grapple with the ever-changing challenges facing conservation (Redford et al. 2018). Conservation professionals have begun to place increasing emphasis on understanding the most effective ways to learn through their work (Pullin and Knight 2001;Dicks et al. 2014), especially recognizing the need for a relationship between what we learn, know and do.
Numerous models aim to embed learning into conservation practice, for example, adaptive management (Holling 1978), The Open Standards for the Practice of Conservation (CMP 2013), management effectiveness evaluation (Hockings et al. 2006), and structured decision-making (Gregory et al. 2012). These models tend to emphasize more rigorous measurement of effectiveness and disciplined recording of activities. These are important activities but they are insufficient for effectively grappling with the complexity of wicked problems. Systems thinking (including complexity science) and evaluation are two transdisciplines that seek positive outcomes to complex collaboratively defined problems. By integrating different approaches focused upon learning to create actionable shared knowledge (Wickson et al. 2006) across multiple contexts, these transdisciplines have philosophies, theories, methods and tools that, if integrated into conservation science and practice, offer insights that the conservation professional can use to positively transform their approach to their work.
The Silwood Group (i.e., us, the authors) is a team of scholars and practitioners from the fields of conservation, evaluation, and complexity and systems thinking that brings together over 200 years of expertise in the design, management and assessment of over 1000 initiatives from across the sectors of business, development, education, environmental management, healthcare, natural resources management, and social services. We formed The Silwood Group in late 2014 to improve the ability of conservation professionals, volunteers, funders and other stakeholders to grapple with wicked problems. Recognizing the opportunity to increase the conservation community's exposure to well-established philosophies, theories, methods and tools from systems thinking and evaluation as applied in other sectors, we offer this learning to the broader conservation sector to promote the achievement of conservation goals for a more sustainable and equitable future. We frame our consolidated knowledge through a lens of praxis.
We seek to present and enrich the concept of praxis for conservation professionals and organizations that aim to improve their practice. We broadly define effective conservation as any purposeful activity that involves people successfully working towards achieving their explicitly stated goal of ensuring the persistence of nature, in ways that do not compromise human well-being. We recognize that individual perspectives on what constitutes 'effective' will vary according to their values, beliefs and context. We present four principles of a praxis for effective conservation, each illustrated through examples. A glossary of useful terms (Table 1) and a compendium of tools and their potential applications (Table 2) are provided to assist readers new to evaluation and systems thinking. We note that our personal experience indicates that a subset of conservation professionals struggle deeply with accepting the validity of non-reductionist philosophies, theories, methods, tools and approaches. The widely accepted use of these in other sectors, however, is a testament to their robustness and utility, and we argue, to driving the transformation of the conservation sector, through learning, towards increasingly effective thinking and practice.

Praxis and conservation
Praxis is the purposive process of acting on, embodying or realizing an idea, theory or concept. The concept of praxis has a long history, stretching back to Aristotle (384 BC to 322 BC). The modern use of praxis has many lineages that might be traced back to the enlightenment period of critical philosophy initiated with Immanuel Kant (1724-1804), on the back of questioning the mind-body dualism (e.g. theory vs. practice) most commonly associated with Renee Descartes (1596-1650). Since the eighteenth century, the application of praxis, beyond simple philosophical discourse, to achieve societal transformation is evident in work ranging from general political economy per Karl Marx (1818-1883), the radical pedagogy and educational studies of Paolo Friere , modern feminist and cultural critiques (e.g. Linda Alcoff; Alcoff 2006) and sociology more broadly, including structuration theories coupling social structure and agency (e.g., Anthony Giddens; Giddens 1984). From these various bodies of learning, we find that a useful praxis has three key attributes that are specifically relevant to effective conservation.
First, praxis acknowledges and embraces dualities (i.e. both/and) to promote science and action, knowing and doing. Praxis challenges the notion of dualisms (i.e., either/or), such as the false divides between science and action (e.g., Toomey et al. 2017) and between knowing and doing (e.g., Holling 1978). Dualisms also direct conservation professionals to assign success or failure singularly to outcomes, and focus on the process of planning or implementing action. Instead, embracing dualities endorses the interdependence of different elements, as reflected in notions of science-inaction and adaptive management (Pfeffer and Sutton 1998). As such, practice may precede, and be designed to generate, the knowledge necessary for increasingly effective conservation (Cook and Wagenaar 2012).

Table 1
A glossary of terms defining approaches and concepts derived primarily from the transdisciplines of evaluation and systems thinking as used by the authors when developing the praxis for effective conservation approach presented in this article. We posit that they can prove useful for conservation professionals seeking to adopt a praxis for effective conservation approach to their practice Term

Reductionist
An epistemology based on knowledge being developed through the scientific method-it seeks to reduce complexity and uncertainty by breaking systems down into components Philosophy Patton (2002) Reflection A process of actively pausing to critically consider actions and their outcomes Education Dewey (1933) Resilience thinking A way of exploring human and natural systems as complex entities continually adapting through cycles of change, which seeks to understand the qualities of a system that must be maintained or enhanced to achieve sustainability Ecology, economics, natural resource governance Folke (2006) Significance Judgement about whether an intervention was important, should it be a priority Evaluation Scriven (1991) Situation General circumstances or state of affairs that may affect or be affected by interventions, i.e. the 'real-world' flux of events, people, and ideas. For example: "…changing situations regarding issues of biodiversity and climate change may trigger different conservation initiatives". Contrast with "context" (see above) Systems thinking No specific foundation reference, but refer to: Reynolds and Holwell (2010)  Wenger (1998) Stakeholder A person with an interest or concern in a specific issue~S ystem A set of elements or parts that is coherently organized and interconnected in a pattern or structure that produces a characteristic set of behaviors, often classified as its "function" or "purpose" An approach that draws on systems thinking and complexity to develop an holistic view of a context (interrelationships, perspectives and boundaries) being evaluated Systems thinking and Evaluation Thomas and Parsons (2017) Systems thinking Systems thinking is concerned with understanding the dynamics that influence and shape systems, revealing leverage points that guide actions to move a system towards a desired state

Systems thinking
Meadows (2008) Transdisciplinarity The theory and practice of cooperatively formulating, understanding and solving the contemporary complex problems facing society through a single methodology that embodies the unity of existing, and creation of new, integrative knowledge within and across disciplines Education, quantum physics Nicolescu (2002) Transdisciplines Fields in their own right but whose theory and methods are applied across several fields

Ecological economics
Max-Neef (2005) Transformation An intended change driven through strategically enacted means and processes~T ransformative learning Transformative learning involves positively contesting assumptions and worldviews to challenge entrenched beliefs and enable essential change Evaluation Mezirow (1991) Second, praxis facilitates a type of learning which is essential to improve the effectiveness of conservation initiatives (Dicks et al. 2014). Such praxis is a process that creates space for acknowledging the political dimensions of conservation problems by articulating, revealing and negotiating power dynamics and a diversity of perspectives, particularly from those on the margins (Freire 1970). Praxis fosters conversations about values, providing an alternative to political and positional bargaining, by making transparent our default responses that maintain, and do not allow questioning of, the mental models and disciplinary allegiances that stymie effective action and transformation (Pielke 2007).
Third, praxis is continually attentive to the goals and directions of purposive transformation, i.e., an intended change driven through strategically enacted means and processes. A useful praxis remains mindful of who and/or what may be marginalized by the politics and power imbalances that pervade all conservation initiatives. 'Good' praxis recognizes failure as a rich source of learning, and explicitly and continually experiments with new approaches and processes developed from both successful and failed activities to solve entrenched conservation problems. The praxis process can then facilitate learning to inform future actions and, where and when necessary, adjust goals and activities as part of an iterative process. Taking the time to reflect on the diversity of elements comprising a conservation context and the ways in which they interact and evolve is an essential prerequisite for attending to purposive transformations in conservation contexts and embedding learning within individuals and organizations (Salafsky et al. 2002).

Systems thinking: describing and understanding situations
Reductionist sciences, such as analytical chemistry, population ecology and social psychology, often generate knowledge about how entities or phenomenon function by systematically reducing a 'whole' into ever-smaller components. In contrast, the discipline of systems thinking purposively attends to the relationships and interactions between parts identified as relevant and the interconnected whole of situations (Reynolds and Holwell 2010). Since the mid-20 th century, systems thinking has provided frameworks and tools (Table 2) to reveal the context of conceptually bounded problem situations. These are described and rendered as systems, which can be simply defined as a collection of entities perceived by someone as interacting together to do something. Inherent in this definition is a condition that systems are not predetermined but rather purposeful. As such, there are multiple valid perspectives on, and representations of, a purpose, problem, or situation (Cilliers 2005).  (1973) Wisdom The evaluation of understanding to make judgements about how to apply said understanding to individual challenges and contexts Philosophy, systems thinking Ackoff (1989) Worldview How a person's values and experiences combine to shape the way they interpret and understand the contexts and situations they inhabit Philosophy Thompson et al. (1990) Worth Judgement about whether an intervention: has value to affected stakeholders, or was needed Evaluation Scriven (1991)

3
Deciding what constitutes a 'whole' system in a given context involves making decisions about what parts and processes, natural and social, are included and excluded. These 'boundary judgements' (Ulrich and Reynolds 2010) demarcate a perceived system from its broader situation, environment, and histories, and may be referred to as the 'system of interest'. Given that boundaries of a system of interest are human constructs, systems are inevitably partial as they: (1) delimit only a subset of all possible inter-relationships; and (2) inevitably serve to meet the needs of some stakeholder groups better than others (Ulrich 2003). When the demarcation of a system of interest does not comprise an explicit process, misunderstanding and conflict may arise when different stakeholders make different boundary judgements based on their different values, experiences and priorities. For example, the ways in which power is distributed within both implicit and explicit political processes influences who is involved in decision-making, which may promote or curtail elite capture of benefits derived from purposive transformations in a system.
Systems thinking in practice comprises three activities: (1) understanding interrelationships between elements; (2) engaging with multiple perspectives; and (3) reflecting on boundary judgements (Reynolds and Holwell 2010). Figure 1 illustrates this for variables related to these three activities-interrelationships ranging from a small number of tight interrelationships to many loose interrelationships; multiple perspectives ranging from a few explicit convergent perspectives to many implicit, divergent perspectives; and boundary judgements ranging from a few closed and fixed boundaries to many open flexible boundaries. In social-ecological systems, interrelationships include stakeholders and their relation to one another (Checkland 2000). Stakeholders have unique perspectives, determined by individual values and worldviews (Biggs et al. 2011), meaning a system of interest has multiple potential boundaries related to physical, spatial, temporal, and social attributes. Boundaries may be fixed, for example, using the perspective of one stakeholder group at the expense of others, or more helpfully, adaptable to situational changes.
Understanding the importance of boundary judgements is integral to the work of all conservation professionals. For example, conservation biologists may be required to map the spatial distribution of a plant species' habitat to inform restoration activities, or a protected area manager to decide which stakeholders are most affected by management decisions. In many cases, decisions must be made as to what elements of a system are in, and what are out, of bounds. The existence and effect of the different perspectives presented by stakeholders are likewise embedded within conservation initiatives. Professionals associated with conservation have historically taken a narrow view of the systems they  Fig. 1 A conceptual tool comprising the three dimensions of a system that are often most useful for establishing a foundation for an effective conservation initiative, namely: (1) interrelationships; (2) multiple perspectives; and (3) boundary judgements. This conceptual tool can assist a group of stakeholders to: (1) identify a 'system of interest' in which they wish to intervene; and (2) structure an evolving process for deciding "what action is next" to deliver an increasingly complete understanding of their 'system of interest'. The understanding generated through this tool can then be applied to the design and selection of conservation strategies, inclusive of philosophies, theories, methods, tools, mechanisms and approaches that are well-matched to the characteristics of the 'system of interest'. The small cube in the lower-front corner represents 'systems of interest' that might be most usefully understood through experimental studies (i.e., a system presenting fixed boundaries few in number; a few tight interrelationships; and a few explicit but convergent perspectives). In contrast, the small cube in the upper-back corner represents 'systems of interest' typical of 'wicked' conservation challenges (i.e., the system has many open and flexible boundaries; many loose interrelationships; and many implicit and divergent perspectives) 1 3 work in, bounding systems in ways that largely exclude the people, institutions and political processes that impact them (Dowie 2011). Conservation biologists are often highly proficient in the use of reductionist experimental methods to identify causal relationships within systems of interest where boundaries are fixed and not open to interpretation or change, relationships are few and tightly connected, and perspectives explicitly-stated and converging around similar values (Fig. 1). However, these characteristics rarely typify conservation situations. If a subset of perspectives becomes privileged, the knowledge used to make judgements and take action is incomplete and therefore inadequate. Emergence of the concept of social-ecological systems (Berkes and Folke 1998) represented a move to address the limitations of a reductionist perspective as it affects conservation challenges, and provides a platform for further theoretical and practical advances (Liu et al. 2007).

Evaluation: values, learning and judgement
The formalization of the transdiscipline of evaluation can be traced back to federally funded social programs in the United States in the 1960's. These programs were accompanied by a requirement for an evaluation to determine their effectiveness. The field has evolved from narrowly defined programs to large-scale initiatives and processes, as well as community-based development and advocacy. It has had a longstanding emphasis on learning and improvement rather than simply proving that an intervention "works" (WKKF 2017). For the past two or three decades, four themes of particular emphasis have been: the participation of stakeholders (participatory evaluation ;Cousins 2003), the importance of attention to culture (culturally responsive evaluation; Hood et al. 2015;Thomas and Parsons 2017), the evolving nature of interventions (developmental evaluation; Patton 2011) and attention to complexity especially in social systems and networks (systems-oriented evaluation; Preskill and Gopal 2014;Parsons 2012;WKKF 2017).
The transdiscipline of evaluation comprises a deep body of knowledge and scholarship incorporating three dimensions: values, methods and use (Christie and Alkin 2012). Rather than a one-size-fits-all approach, evaluation today consists of a portfolio of philosophies, theories, methods, tools, social networks and knowledge to suit a wide range of contexts (Table 2) (e.g., WKKF 2017; Davidson 2005). The process of evaluation permeates all dimensions of an initiative, and is focused squarely on learning and the utility of processes and outputs (Patton 2008;Christie and Alkin 2012).
The process of evaluation has been defined across many sectors as the determination of merit (e.g., how effective was an intervention?), worth (e.g., how valuable was an intervention?) and/or significance (e.g., how important was an intervention?) (Scriven 2007). In contrast, in conservation, evaluation is most commonly a process for determining only the effectiveness of an intervention (i.e., merit) (Mascia et al. 2014), with less emphasis placed on an intervention's worth and significance, though this situation is improving (e.g., Romero et al. 2017). It is typically implemented as a solitary concluding activity of a management cycle (Schwartz et al. 2017), and is often not implemented at all (e.g., Kapos et al. 2008;Redford et al. 2018). Evaluation is comparatively new, but increasingly familiar, to conservation professionals, particularly those promoting evidence-based conservation (Keene and Pullin 2011), as is evident from the increasing number of studies assessing the effectiveness of protected areas (Geldmann et al. 2013;Gill et al. 2017).
While research typically aims to create new generalizable knowledge, evaluation generates situation-specific information for decision-making. This process occurs within the context of stakeholder values and judgements, serving as a means to communicate those judgements to others with the aim of influencing decisions. A common misconception is that an evaluator makes such judgements objectively, as an independent third party, and while this was formerly the norm (e.g., in the development arena; Easterly 2013), it is no longer common in many sectors. Whilst striving for independence may be useful in some circumstances, many evaluation approaches emphasize the role of stakeholders as active participants in establishing evaluative criteria, decision-making and learning (Patton 2011). Evaluation more often acknowledges the different perspectives, values, culture, politics and histories of people within the situation being evaluated (Hood et al. 2015;Samuels and Ryan 2011). The processes of making meaning from data and providing useful results, i.e., going beyond designing and conducting basic research or inquiry, have become increasingly sophisticated, recognizing varying contexts and purposes. Over recent decades, the evaluation field has expanded in terms of its range of quantitative and qualitative methodologies and the scope of its focus. The evaluative thinking and practices common amongst conservation professionals today typically represent a very small subset of all that are potentially useful to them (Baylis et al. 2016). Accordingly, we outline a set of approaches and tools we believe are useful in Table 2.
The discipline of evaluation is active in at least 158 regional, national and international professional organizations totaling approximately fifty thousand members (http://evalp artne rs.org/about /inter natio nal-mappi ng-ofevalu ation -assoc iatio ns). These institutions and processes ably support the development of a praxis that is well-suited to tackle the diversity and complexity of conservation situations.

Principles of praxis for effective conservation
In a world where all biophysical systems have been impacted by humanity, what form of praxis will best contribute to effective, worthy and relevant conservation (Ison and Schlindwein 2015)? Here, we present a 'praxis for effective conservation' approach embodied in four principles. These emerged from our review and synthesis of both our collective expertise and the fields of evaluation, systems thinking, and conservation; the design and delivery of two workshops in 2014; and the learning generated in the process of drafting this paper: 1. Attend to the whole with humility. 2. Engage constructively with the values, cultures, politics and histories of stakeholders. 3. Learn through evaluative, systemic enquiry; and. 4. Exercise wisdom in judgement and action.
In introducing these principles, we reinforce our belief that effective conservation initiatives recognize whole social-ecological systems, ensuring the persistence of nature without compromising human well-being. For each principle, we discuss how common approaches to conservation could be transformed through its application. We also present a suite of evaluation and systems thinking approaches and tools that may support praxis (Table 2), and offer examples of their use in linked social-ecological systems.

Attend to the whole with humility
Uncertainty and complexity are intrinsic qualities of living systems. Effective conservation action must move beyond reductionist science, giving due attention to the uncertainty permeating these systems (Holling 2001). Humility allows people to accept that, despite all we do know, in most systems of interest, uncertainty is high and predictability low. Likewise, it is increasingly recognized by conservation professionals that we cannot know, understand, or gather data on all dimensions of ever-changing systems (e.g., Cowling et al. 2010). Humility is also fundamental to including stakeholders in collaborations that acknowledge the existence and validity of different values and types of knowledge. Humility is the foundation upon which trust is developed.
In contrast to a traditional view of conservation (i.e., people excluded from nature; Mace 2014), Attending to the whole requires consideration of the richness of nature-human interrelationships (i.e., people connected with nature; Zylstra et al. 2014), genuine engagement with multiple perspectives, and careful reflection on where to draw system boundaries (Reynolds 2011). Recognition of dualities (e.g., conservation and development, traditional and contemporary, outsiders and locals) across a range of spatial and temporal scales (Valters 2015) sets the foundation for a praxis for effective conservation. Developing a shared understanding of these, and other, dualities might begin with the use of tools such as mental models, logic models and theories of change (Table 2). These tools capture and communicate how individual actors understand a system (Biggs et al. 2011), boundary critique can assess the consequences of working with specific values and realities to make judgements (Ulrich and Reynolds 2010), and rich pictures to qualitatively and holistically identify phenomena that influence a system (Table 2; Bell and Morse 2013). Accurately and precisely conceptualizing a system enables understanding (e.g., through complex adaptive systems models), analysis (e.g., exploring the implications of bounding a system), identification of leverage points (e.g., targeting incentives for human behavior change), and hence purposive transformation of complex, complicated and/or conflictual situations (e.g., through design of a process for protecting rhinoceros from criminal poaching).

Engage constructively with the values, cultures, politics and histories of stakeholders
The power imbalance among those who directly and indirectly benefit from the use of natural resources, and those who bear the potential costs of conservation choices, have been underrepresented in conservation (Barry and Oelschlaeger 1996), as conservation practice as historically been driven by the values and politics of Western conservation scientists and practitioners (Adams and Mulligan 2003). These persistent, long-term power imbalances manifest as structural inequities that, ironically, contradict the value systems of many conservation professionals. Fortunately, recognition of the need to Engage constructively with the values, cultures, politics and histories of stakeholders, and other social dimensions, is gaining momentum in the formulation of social-ecological approaches to conservation (e.g., Bennett et al. 2017). Where the diversity of local values and knowledge has not been engaged, conservation decisions can result in polarized views that lead to local peoples' displacement or resource-use restrictions aimed to fence-in nature (Adams and Mulligan 2003). Even within the confines of the scientific community there are polarized worldviews derived from different values and perspectives. For example, species triage (i.e., prioritizing species with the greatest potential to be conserved, rather than the most endangered) is highly 1 3 controversial, as it can lead to decisions that accept extinctions to ensure greater overall conservation outcomes (Bottrill et al. 2008). Such judgements are unacceptable to some because it may mean the loss of species valued for personal, cultural or religious reasons (Jachowski and Kesler 2009). Similarly, wildlife hunting is abhorrent to some, while others believe sustainable exploitation is a right that facilitates private and communal land conservation, and that may ultimately achieve conservation goals most effectively (Naidoo et al. 2016).
Engaging constructively with stakeholders whose values and worldviews reinforce the dichotomies that impede the conversations necessary for developing and implementing a useful praxis for effective conservation is central to identifying equitable and resilient approaches to conservation challenges (Tuhiwai Smith 2018). By example, culturally responsive evaluation (amongst other approaches) evolved to address challenges such as: power inequities, especially among groups traditionally under-served or marginalized; elite capture of benefits, and; the validity of different cultural perspectives as it relates to decision-making (Hood et al. 2015).
There are different ways to assist in making visible disparate stakeholders' perspectives (Table 2). Platforms and tools for building dialogue (e.g., consequence tables and focus groups, appreciative inquiry, participatory mapping), when used to include the range of stakeholders, can capture and make transparent the multiple values, objectives and expectations common to conservation initiatives. These approaches are also important to reveal the inevitable tradeoffs and identify actions that could maximize benefits and minimize conflicts between different actors and their objectives (Gregory et al. 2012). Scenario planning can capture the role of values in understanding the present drivers of change and envision future social-ecological contexts based on deliberation and negotiation (Malinga et al. 2013). While a few of these tools are commonly used in conservation, the widespread application of a more comprehensive toolkit (Table 2) will more effectively engage a still-untapped potential to help make the role of values, cultures, politics, histories and expectations explicit, revealing how they influence a system or promote collaborative judgements to encourage wiser action.

Learn through evaluative, systemic enquiry
There is a range of decision-making frameworks that have been applied in conservation to assist in the integration of program design, implementation, monitoring and evaluation, and re-conceptualization to test assumptions and promote learning and adaptation (e.g., adaptive management, management effectiveness evaluation, structured decision-making; see Schwartz et al. 2017). There is often a specific desire to include monitoring and evaluation within conservation programs to facilitate management and learning (Mascia et al. 2014), but these activities are often not implemented, or are implemented ineffectively (Legg and Nagy 2006;Redford et al. 2018). Common barriers include failure to commit funding to these activities, unsupportive political contexts, limited technical and methodological capacities, particularly in developing countries (e.g. Ortega-Argueta et al. 2016), along with the fear of exposing failures (Redford and Taber 2000).
This absence of monitoring and evaluation activities suggests practitioners are concerned by the costs of publicly recognized failures more than they are by the time and financial costs of these activities (Redford and Taber 2000). Further, it suggests that the improved practices generated by learning from failure are discounted against acknowledging failure. This perspective contrasts the common rhetoric that learning is an essential activity for effective action, as reflected by its inclusion in most evidence-based decisionmaking frameworks (Cook et al. 2016). Fear of failure and purported dichotomies (e.g., planning versus implementation), commonly restrict flows of information and opportunities to learn in the conservation sector, as demonstrated for spatial prioritization (Knight et al. 2008) and recovery planning (Bottrill et al. 2011).
A strong praxis for effective conservation enables simultaneous planning and implementation because it is supported by activities that, accompanied by continual reflection, generate learning that informs both theory and action. The linear model of knowledge transfer where academic researchers and institutions are the holders and providers of knowledge while practitioners are the users of that knowledge is outdated and hinders praxis (Pielke 2007;Toomey et al. 2017). The knowing-doing "gap" is not usually a breach along a linear information exchange pathway but rather a "knowing-doing space" comprising the dimensions perceived by stakeholders as relevant for transforming social-ecological systems (Toomey et al. 2017). Effective learning depends upon whether the "right" questions are asked of stakeholders. Evaluative inquiry (the systematic practice-oriented process of using empirically derived and value-based data to craft and investigate questions of interest (Parsons 2009)) and governance structures and dialogue platforms through which knowledge can be developed between all stakeholders, can help. Evaluative thinking-the combination of critical thinking, creative thinking, inferential thinking, and practical thinking-can be used in complex systems to, for instance, craft contextually specific approaches to using fit-for-purpose questions that generate reasoned, evidence-based judgements about value (Vo and Archibald 2018). For example, wildlife-users occupying Wildlife Management Units in Mexico are linked by a monitoring and 1 3 reporting system of ecological (e.g., species, harvest rates and uses) and socioeconomic (e.g., legal wildlife products, markets and income) indicators. Information is collated and reported to national government and donors to develop better policies, management guidelines and technical training for wildlife users (Ortega-Argueta et al. 2016). More generally, the introduction of reporting and feedback systems by donors that require conservation organizations to clearly demonstrate learning, inclusive of learning from failures, as a pre-condition for securing and maintaining funding is one potential mechanism for promoting learning.
The portfolio of evaluative resources to support learning is expansive. Management effectiveness evaluation (e.g., Hockings et al. 2006), derived from utilization-focused evaluation (Patton 2008), and adaptive management, are familiar and put to use by a proportion of conservation professionals. Other resources in the rapidly growing collection of systemsand complexity-oriented methods, tools and approaches are not yet mainstream outside of the professional evaluation community (Table 2; Williams and Hummelbrunner 2010), suggesting stronger, more formal transdisciplinary collaborations between professional evaluators and conservation professionals are essential.

Exercise wisdom in judgement and action
People extract value from experience and learning in different ways, using different approaches and understandings. One conceptualization of this process, the DIKW (Data-Information-Knowledge-Wisdom) Framework, identifies distinctions and links across this spectrum (Ackoff 1989). By example, scientists gather data (i.e., observations recorded but unprocessed) to generate information (i.e., data processed, useful for decisions and action) that is organized and applied to become knowledge (i.e., information contextualized, cause-effect relationships determined). Wisdom (i.e., the ability to think, act and utilize knowledge, experience, understanding, and insights; Ackoff 1989) is frequently neglected. However, each element is considered a prerequisite for those subsequent ones, magnifying the utility for affecting positive change. Conservation biology has often gathered data and information at the expense of generating knowledge and wisdom (e.g., Stuart et al. 2010), despite the often rapidly diminishing returns on such investments (e.g., Grantham et al. 2008).
Wisdom is a prerequisite for effective conservation. For example, wisdom is central to assessing the merit, worth and/or significance of the relationships between actions and outcomes in the context of human values. But whilst data and information are developed from past experiences and activities, knowledge and wisdom are focused on making judgements for the present and the future. Practical wisdom underpins choices about the next challenge to be addressed and the next actions to take, and hence the vision and design, of effective conservation initiatives (Schwartz and Sharpe 2006). To build conservation wisdom, all potential knowledge in all its different forms must be respected, articulated and accessible for use.
Conservation thinking is increasingly enriched through the diversity and depth of different knowledge systems, which bolsters its ability to gain wisdom or use the wisdom already present in a system. The incorporation of, for example, traditional ecological knowledge into conservation initiatives has improved outcomes (Berkes et al. 2000). Knowledge complementarity and interaction are now recognized within the Convention on Biological Diversity, the Intergovernmental Platform on Biodiversity and Ecosystem Services (IPBES) and the Sustainable Development Goals as relevant for the conservation and sustainable use of nature, while safe-guarding local knowledge, innovations, respect and practices of local communities. Inter-cultural education in Mexico and Tanzania has contributed to enhanced critical thinking and new knowledge construction for advancing conservation goals (Burford et al. 2012). Given the ongoing erosion of local and traditional knowledge, the conservation sector will benefit from accessible, useful, credible knowledge-sharing platforms that are well-matched to the complexity of its endeavors.
A variety of approaches and methods can assist to put wisdom to work amidst complexity (Table 2). A few of the promising ones include Adaptive Action (Eoyang and Holladay 2013), Lean Startup (Ries 2011), developmental evaluation (Patton 2011) and culturally responsive evaluation (Hood et al. 2015;Thomas and Parsons 2017). In the emerging conservation contexts where software development is increasingly important, Agile methods and practices will already be common (Table 2; Schwaber and Beedle 2001). These approaches tend to be evaluative and systemsoriented, often based on rapid iterative cycles of visible knowledge generation and learning that facilitate transparent decision-making about wise actions.

Conclusion
Conservation organizations are investing immense effort in grappling with 'wicked problems'. We have argued that philosophies, theories, methods and tools drawn from the fields of systems thinking and evaluation can enrich the capacity of conservation professionals and organizations individually and collectively to grapple with these challenges. This begins with reconceptualizing the ways in which people define and engage with conservation challenges, looking within ourselves, our teams and our organizations, rather than simply continuing to adopt the outward-looking perspective that currently dominates conservation thinking and practice (e.g., our focus upon people imposing threatening processes upon nature). Here we have introduced the idea of a praxis for effective conservation based on four principles. These are founded on, and synthesized from, the established transdisciplines of systems thinking and evaluation whose long histories of understanding, grappling with, and learning through, 'wicked' problems may serve as a strong foundation for this transformation towards greater effectiveness. In developing these principles, we (The Silwood Group) have identified some of our own unchallenged assumptions, gaps in our knowledge, and limitations of our worldviews and practices. We look to engage with other professionals to enact and improve these principles, and trust that the strong sense of discomfort felt when confronting the limitations of all our practices does not deter us from reflecting upon, and enacting, positive change.