- Research article
- Open Access
- Open Peer Review
The application of system dynamics modelling to environmental health decision-making and policy - a scoping review
BMC Public Healthvolume 18, Article number: 402 (2018)
Policy and decision-making processes are routinely challenged by the complex and dynamic nature of environmental health problems. System dynamics modelling has demonstrated considerable value across a number of different fields to help decision-makers understand and predict the dynamic behaviour of complex systems in support the development of effective policy actions. In this scoping review we investigate if, and in what contexts, system dynamics modelling is being used to inform policy or decision-making processes related to environmental health.
Four electronic databases and the grey literature were systematically searched to identify studies that intersect the areas environmental health, system dynamics modelling, and decision-making. Studies identified in the initial screening were further screened for their contextual, methodological and application-related relevancy. Studies deemed ‘relevant’ or ‘highly relevant’ according to all three criteria were included in this review. Key themes related to the rationale, impact and limitation of using system dynamics in the context of environmental health decision-making and policy were analysed.
We identified a limited number of relevant studies (n = 15), two-thirds of which were conducted between 2011 and 2016. The majority of applications occurred in non-health related sectors (n = 9) including transportation, public utilities, water, housing, food, agriculture, and urban and regional planning. Applications were primarily targeted at micro-level (local, community or grassroots) decision-making processes (n = 9), with macro-level (national or international) decision-making to a lesser degree. There was significant heterogeneity in the stated rationales for using system dynamics and the intended impact of the system dynamics model on decision-making processes. A series of user-related, technical and application-related limitations and challenges were identified. None of the reported limitations or challenges appeared unique to the application of system dynamics within the context of environmental health problems, but rather to the use of system dynamics in general.
This review reveals that while system dynamics modelling is increasingly being used to inform decision-making related to environmental health, applications are currently limited. Greater application of system dynamics within this context is needed before its benefits and limitations can be fully understood.
There is growing recognition of the complexity that underlies environmental health problems and their management  and with it the need for sound environmental health policy and decision-making that embraces this complexity . To embrace this complexity, managers of environmental health issues must move away from reductionist approaches to decision-making, as environmental health hazards are influenced by a multitude of interacting factors that may not initially appear related . This can result in policy resistance, which is the tendency for policies to be ineffective or have unintended consequences that create new problems or exacerbate the original problem . Examples include the digging of wells in South East Asia to combat diarrhoea caused by poor quality surface water, resulting in the largest exposure in history of a population to arsenic-contaminated groundwater , and making dwellings in the United Kingdom more air tight to improve household energy efficiency, resulting in increased indoor exposure to radon .
Decision-makers, more than ever, are required to integrate scientific and expert-based evidence into decision-making. Complexity can hinder evidence-based decision-making by slowing and weakening the ways in which evidence is collected, interpreted and translated into action . Evidence for complex problems can be lacking, limited and ambiguous, and is often presented without links to the broader context for which the evidence is required. Also, the analytical tools currently used to support evidence-based decision making, such as statistical modelling, are limited in their ability to explain causation and the effect of non-linear interactions and feedback on the behaviour of complex systems . Given this, there is a need to provide decision-makers with the tools necessary to understand complex environmental health issues as part of implement more scientific decision-making processes.
System dynamics modelling is a problem-oriented modelling approach pioneered by Jay Forrester in the late 1950’s to help corporate managers better understand industrial problems . Since then, its application has expanded to fields ranging from ecology to economics. Examples of its use include modelling the dynamics of the earth’s climate , healthcare systems , the food industry  and the military . System dynamics involves causal mapping and the development of computer simulation to understand system behaviour. Policy and scenario options are then systematically tested to answer “what-if” questions . This allows policy-makers to experiment with their decisions before implementation in the real world. This decision-experimentation creates a learning environment in which policy makers gain a better understanding of how the system will respond to their decisions and the potential unintended consequences of decisions.
Conventional problem solving tends to approach complex problems by breaking them into their component parts and examining them separately. System dynamics centres on the idea that problems exist due to the interactions, feedback loops and material and information delays among component parts within a system. System dynamics therefore focuses on the relationships between the parts rather than focusing on separate parts in isolation . System dynamics also draws strongly on the concept of endogeneity, meaning that it seeks to find explanations for system behaviour by understanding the internal structure of a system rather than focusing on factors external to the system . For example, when trying to understand why medical errors still occur in seemingly well-managed hospital settings, the temptation is to blame the problem on individual-level factors beyond the control of the hospital, such as incompetent or lazy practitioners. An endogenous perspective would take the view that most medical errors are the result of a combination of systemic factors such as the practitioner’s patient load, training, medication labelling practices, hours worked, etc. and thus the solution lies within understanding how these factors contribute to medical errors and modifying the system to prevent errors.
In this paper we review the application of system dynamics to the management of environmental health issues. System dynamics has been used to understand the interactions between human health and the environment before, such as zoonotic infections , the relationship between air pollution, health and population growth , the societal costs and benefits of commuter bicycling , the effect of land use and transport policies on health  and malaria control . However, many of these applications do not demonstrate how, or if, an understanding of system dynamics can lead to better policy and decision-making. Therefore it remains unclear whether the findings of these previous applications of system dynamics have remained within the confines of academia or if they have been applied to inform real decision-making processes.
An increasing number of authors advocate for the use of systems thinking and system dynamics in epidemiology, public health and health service delivery [22,23,24], but it is unclear to what extent system dynamics has actually been used to inform policy or decision-making processes in environmental health service delivery. The objective of this review was to answer the following question “How is system dynamics being used to inform decision-making processes related to environmental health?” To answer this question we conducted a scoping review of the scientific and the grey literature.
We used a scoping review method because the objective of the review was to broadly explore how system dynamics has been used to inform environmental health decision-making processes, as opposed appraising the quality of individual studies. Scoping reviews search a wide range of research and non-research reports to uncover the breath and extent of research and application for a particular topic . The design of this study was guided by the scoping review guidelines developed by Arksey and O’Malley  and the recommendations proposed by Levac, et al. , but included an additional step where papers where re-screened based on their relevancy to objectives of this review. The result was a five-step process: formulation of an objective, identification of potentially relevant science and grey literature through a systematic search, secondary screening using a framework of relevancy-based criteria to select literature the most suitable for review, recording of relevant key themes emerging from the literature, and reporting of results.
Given the extent of this scoping review, we do not claim that the literature captured is an exhaustive or complete list of the scientific and grey literature on this topic, rather a representative sample of the available literature.
Identifying relevant reports
A systematic search of the literature in the Pubmed, Embase, Web of Science and Scopus databases was conducted. Following an initial broad search of the literature, and in consultation with a health-science librarian, three conceptual focus areas (search themes) with associated search terms were identified: environmental health, system dynamics, and decision-making. The search terms used in combination included (“environmental health” OR “environment and public health” OR “environment”) AND (“systems thinking” OR “systems science” OR “systems approach” OR “systems theory” OR “systems analysis” OR “system dynamics” OR “dynamic systems”) AND (“health policy” OR “policy making” OR “decision making” OR “health planning” OR “policy” OR “‘decision support system” OR “decision support techniques” OR “environmental policy”). Where available, we used indexing terminology (MeSH and Emtree) that corresponded to the search terms. The search was limited to reports published in English between the years 2000 and 2016. The review was limited to reports published after 2000 to reflect the significant increase in publications related to systems thinking and systems science that has occurred since then , as well as the rapidly-evolving nature of the field of environmental health .
The same search terms were used in the Google search engine to similarly identify relevant grey literature.
Reports captured though the search of the academic and grey literature were initially screened according to inclusion criteria developed for this review (Table 1).
To ensure that the retained reports would meet the objective of this review, we developed three relevancy criteria (Table 2) to determine the strength of each paper pertaining to the three conceptual focus areas of this review: environmental health, system dynamics and decision-making. This relevancy approach was adopted because the concepts of environmental health and decision-making are broadly-defined concepts that do not lend themselves to specific inclusion criteria. Reports retained during the initial screening process were then screened according to the relevancy criteria. Reports classed as ‘somewhat relevant’ or ‘not relevant’ to one or more of the relevancy criteria were excluded from further review.
Reports that were classed ‘relevant’ or ‘highly relevant’ for all three relevancy criteria were included in this review. For each retained report, data on the location, sector of application, project objectives, link to health and type of system dynamics analysis techniques used was organised in a Microsoft Excel® spreadsheet. Reports were also analysed to identify key themes related to the stated rationales for using system dynamics, the intended impact of system dynamics modelling on decision-making, the targeted scale of decision-making and limitations and challenges associated with system dynamics modelling.
A total of 5732 unique reports were identified by searching scientific databases (Fig. 1). An additional 84 publications were identified through a search of the grey literature, a search of the reference lists of retained articles, and the ‘related articles’ or ‘cited by’ section in the databases. At the end of initial screening using the inclusion criteria, 166 reports were retained. Screening according to the relevancy criteria left 15 reports for final review.
The general characteristics of the 15 reviewed reports are outlined in Table 3. Of these, 47% (n = 7) of the studies were conducted in the United States of America. The rest were conducted in the United Kingdom (n = 2), Canada (n = 1), New Zealand (n = 1), Taiwan (n = 1), Colombia (n = 1), Bolivia (n = 1) and in both Ghana and Ethiopia (n = 1). The majority of the studies (67%) were conducted within the last 5 years (2011–2016), which suggests recent and increasing interest that systems science that has been identified in other areas of the published health literature .
The reports used system dynamics to inform decision-making within, and across, a number of different sectors, and all relevant to environmental health. The greatest number came from within the health sector (n = 6), with the remaining coming from the transport sector (n = 2), the public utilities sector (n = 1), the water sector (n = 1), the housing sector (n = 1), food sector (n = 1), the agricultural sector (n = 1), and the urban and regional planning sector (n = 1). Additionally, one report was multi-sectoral within both the urban and regional planning and the transportation sector.
The majority of reports (n = 11) explicitly dealt with the relationship between environment and human health, using system dynamics to map and/or model system structures and behaviours that govern environmental conditions and their effect on human health. The remainder of reports (n = 4) had an inferred link to health. In these cases, structural and behavioural links between environmental conditions and environmental health hazards, such as air pollution and water pollution, were modelled. These models were broadly focused on creating and testing policies whose multiple objectives included the protection of human health or the creation of health-supportive environments.
The majority of reports (n = 13) used system dynamics to conduct systemic analysis of a problem and then used simulation and policy analysis to model and test the outcome of various policies. The remaining two reports used system dynamics in only a qualitative way, using causal loop diagrams to qualitatively analyse the relationship between system structure and problem behaviours.
Stated rationales for using system dynamics
Eleven of the publications stated one or more rationales for using system dynamics methods. Many of the stated rationale focused on the technical capabilities of system dynamics models, including their ability to identify and account for sources of uncertainty in the understanding of causal relationships [30, 31], account for long time-delays between action and effect , reveal the endogenous sources of system behaviour [32, 33], and link the dynamic effects of policy actions to system structure and behaviour [31, 34, 35]. Others focused on the predictive capabilities of system dynamics models including their ability to integrating multiple types of information into policy analysis [36, 37], assess program and policy intervention trade-offs [38, 39], and explore the effects of proposed policies over a chosen time scale [35, 38]. Lastly, a number of the publications also included process-related factors in their rationale for using system dynamics modelling, including its strength at making sense of the complexity of the problem [33, 38], and its potential to facilitate inter-sectoral and stakeholder engagement [33, 37,38,39].
Intended impact of system dynamics modelling on decision-making
The intended users of the outcomes of system dynamics modelling fell into two categories: the decision- or policy-makers themselves, and the stakeholders affected by or involved in decision-making processes (Table 4).
One of the key uses of system dynamics identified in the reports was decision support for making policies and decisions. In these instances, the goal of the system dynamics modelling process was to compare the results of various policy scenarios to inform strategic policy decisions. Some of the models were designed to provide decision-support for a specific project or policy issue, such as the model designed in Kolling et al. , which was used to explore the community-level impacts and viability of a light rail project. Other models were intended for integration into existing or future decision-making processes, such as the model described in Chen et al. , which was designed for the model to be integrated directly into the analysis and review phases of a county-level urban planning process.
System dynamics models were also used to influence the way that decision- or policy-makers approach a particular topic or policy issue. In several of these reports the authors describe the modelling process itself as having significant benefit, irrespective of the results the model produced. Stave and Dwyer  reported that the collaborative process of creating the system dynamics model provided a means for integrating traditionally separate land use, transportation and air quality planning processes. This integration compelled decision-makers in each sector to shift their perspective away from focusing solely on their particular area of practice to viewing the system as a whole.
This review found that applications of system dynamics to inform or influence environmental health decision-making extended beyond those targeted directly at informing decision-makers, and also included processes targeted at engaging stakeholders in decision-making processes. For example, Stave  used system dynamics modelling as a means to integrate stakeholder feedback into the decision-making process, with the idea that if stakeholders are involved in making strategic decisions, they are more likely to ultimately help implement the outcome of those decisions.
Targeted scale of decision-making
The review also showed that system dynamics was used to inform policy and decision making processes at two distinct levels: macro-level decision making (national or international) and the micro-level (local, community or grassroots).
System dynamics was used to exclusively support micro-level decision-making processes in over half of the studies (n = 9). Macro-level policy and decision-making was the primary focus of four studies targeted at decision-making in federal/national government departments.
Two studies used system dynamics to influence decision-making at both levels. The URAdapt project  targeted decision-making processes and policy actors at both the local and national level because the urban water supply systems in Addis Ababa and Accra fell under both the jurisdiction of local municipalities and national-level government departments. System dynamics was used in the Durham-Orange Light Rail Project in Durham, North Carolina  to inform and engage both federal and local decision-makers because components of the project fell under mandates at both levels.
No studies were identified where decision-making or policy at the meso-level (regional, provincial or state level) was the target.
Limitations and challenges associated with using system dynamics for environmental health decision-making
Twelve reports referred to limitations and challenges associated with using system dynamics modelling within the context of the problem being addressed. For the purpose of this review, only limitations and challenges related to the process of system dynamics modelling or the overall functionality of system dynamics models were analysed. Limitations for the purposes of this review were grouped into three categories: limitations related to those involved in the modelling process, technical limitations of system dynamics, and limitations related to the application of the results to decision-making (Table 5). Note that none of the limitations or challenges identified by the authors appeared to be related specifically to the application of system dynamics to environmental health problems, but rather to the application of system dynamics in general.
To our knowledge, a review of the applications of system dynamics to environmental health decision-making has not been previously conducted. Our findings suggest that the applications of system dynamics to environmental health decision-making is limited given the paucity of reporting, however the applications that were found vary across many different sectors. Our review further suggested that the use of system dynamics in this context represents an emerging field of research and practice, with the number of studies published increasing considerably in the last five years. While many of the reported studies occurred within the public health or health service sectors, there were a variety of non-health-specific sectors using system dynamics to model both environmental and health factors.
The 1986 Ottawa Charter for Health Promotion recognised that the promotion of health cannot be done by the health-sector alone, and that the success of health-promoting activities, such as those occurring within the field of environmental health, depend on the successful collaboration and support of many different sectors . Our review strongly suggests that system dynamics can be used as a method to facilitate the integration of health into policy and decision-making processes in non-health sectors.
System dynamics not only provides direct decision-support for policy analysis, but also provides a means for understanding problems, which in turn informs the way decisions-makers navigate complex decision-making processes. This is consistent with the way in which system dynamics has been used to address complex problems in other fields such as health policy , social care , strategic management , and transportation .
System dynamics has been used to inform decision-making at either the micro or macro-level, with limited application targeted at decision-making across multiple levels. While this is potentially due to disconnects between decision-making processes at the micro- and macro-level, it does point to a potential missed opportunity. Complex environmental health problems do not respect jurisdictional boundaries, and can rarely be addressed at only the local or national level. While likely not possible in all situations, the URAdapt project outlined in Raschid-Sally, et al.  demonstrates the potential for system dynamics to be used to address environmental health problems at multiple decision-making levels.
None of the reports included in this review spoke of the effectiveness of the policies or decisions that resulted from the use of system dynamics. While this is not surprising given the recentness of their publication and the time delays between the implementation of decisions and their effects, it does indicate a gap in the literature. Evaluations of the effectiveness of decisions or policies developed based on system dynamics models will help researchers and decision-makers evaluate the merit of using system dynamics to address complex problems.
Multiple limitations and challenges associated with the application of system dynamics were discussed in the reports reviewed, but none were specifically directed at its feasibility for application to environmental health problems. Many of the limitations, such as the level of complexity of the models and a lack of participant openness to challenge their mental models, were consistent with applications of system dynamics in other fields [49, 50].
It is worth noting that some of the identified limitations, such as potential unwillingness of participants to have their mental models challenged, are not necessarily limitations of system dynamics itself, but rather a limitation of the way it is used. While using system dynamics in a participatory learning process increases the chances that participants and stakeholders will critically reflect on their own mental models, there are no guarantees that system dynamics, or any other policy analysis process, can change deeply-held views and positions. These issues are not insurmountable, but require further research and action from both the system dynamics scientists and practitioner community and the wider policy and governance communities. As systems approaches become more widespread and integrated into the way current and future decision-makers think about complex problems, the greater the chance that tools like system dynamics will find a receptive audience.
The number of studies that met the inclusion criteria but were ultimately excluded from the review suggests a missing link when it comes to the application of system dynamics to environmental health decision-making. For instance, reports by McClure et al.  that examined the relationships among transportation, economic development, land use, and population health; and by Pedercini, et al.  that examined the costs and benefits of various malaria control interventions, demonstrated interesting and novel applications of system dynamics in environmental health, but did not link the outcomes of their system dynamics models to a decision-making process. This suggests a gap between basic and applied system dynamics in environmental health and decision-making and policy. The water security model reported by El Sawah et al.  and the waste management model reported by Stave’s  suggest how system dynamics could inform decision-making within the field of environmental health, but these applications lacked a health or health hazard component in their model. This also reflects a disconnect between the fields of environmental management and human health. System dynamics does have significant potential to bridge the gap between environmental management and human health, however this needs further demonstration.
Limitations of the review
This review has several limitations that must be recognised when interpreting the results. First, it identified and summarized only 15 publications, all of which were varied in their rationale and scope. This heterogeneity suggests that while key common elements of the studies could be identified, the complexity of the individual studies were not fully captured. Second, the limited number of reports identified prevents a comprehensive assessment of the benefits and limitations of applying system dynamics to environmental health issues. More applications of system dynamics in this context is called for. Third, the multi-disciplinary nature of environmental health may have caused us to miss some relevant reports. For example, work occurring in sectors such as environmental management, waste management and urban planning – although often not so intended - will directly or indirectly influence human health. It is possible that some authors may not have labelled their work as being related to ‘environmental health’, making it difficult to capture it in reviews such as this one. Similarly, authors describing applications of system dynamics modelling may have used different terminology to describe their modelling approach, which would have caused their work to be missed by this scoping review. Finally, this review relied on reports being in the public domain. While a systematic search of the scientific and grey literature is likely to capture most reports originating from academia, it is likely that there are reports based on system dynamics applications that have not been published.
In a world of rapidly changing environments, environmental health decisions and policies must be made regardless of the complexity of environmental health problems and significant uncertainties about the future. It is crucial that we move past discussing the general merits of a systems approach to addressing environmental health problems, to determining how best to apply systems tools and methods to existing environmental health problems.
Our review suggests that system dynamics is being applied sparingly, but increasingly within the field of environmental health. The method has significant potential when it comes to assisting decision-makers understand and analyse complex environmental health issues, as well predict the outcomes environmental health decisions and policies. System dynamics is currently being used in multiple different sectors to provide direct and indirect decision-support for population health policy and decision-making processes. Despite this, the contribution of system dynamics to environmental health policy remains limited. Current decision-making and governance structures in many public organisations are not designed to integrate the multi-sectoral policy advice that system dynamics can provide. Therefore, the full potential of system dynamics to change the way in which environmental health problems are managed cannot be realised unless the decision-making and governance structures of public organisations are collaborative and coordinated.
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