VISION AT A GLANCE
Systems Epidemiology of Working Life (SEWL) is an emerging explanatory epidemiological science that seeks to advance population-health research by placing the organisation of working life—and the systems through which exposures are generated and patterned—at the centre of epidemiological explanation.
Its central proposition is that Labour Systems, operating through exposure-generating processes, generate and pattern Working-Life Exposure Systems whose cumulative histories may contribute through biological and other pathways to population health and trajectories of Human Functioning across the lifecourse.
By connecting Labour Systems, exposure histories, biological and other pathways, and Human Functioning, SEWL seeks to establish a broader level of epidemiological explanation—one that addresses how the organisation of working life itself becomes a population-health process.
The vision is to advance SEWL from its emerging foundations through rigorous empirical testing, methodological development, comparative research, and international scientific collaboration.
The Scientific Rationale for an Emerging Explanatory Science
Occupational epidemiology has generated indispensable knowledge about relationships between specific workplace hazards, working conditions, disease, and injury. Yet identifying the effects of particular exposures does not by itself explain why exposure patterns arise, why they cluster and accumulate, why they are distributed differently across populations, or how they change across working lives and societal contexts.
Important dimensions of this problem are already addressed across occupational epidemiology, lifecourse epidemiology, exposome science, social epidemiology, systems science, ageing research, and related fields. These scientific traditions provide essential concepts, evidence, and methods for understanding occupational hazards, cumulative exposure, social patterning, biological embodiment, temporal change, and complex systems.
Yet these contributions have not generally been organised around a common epidemiological question: How do the systems through which societies organise working life generate and pattern multidimensional exposure histories across populations, and how may those histories contribute to population health and Human Functioning over time?
SEWL addresses this explanatory gap by placing Labour Systems and the exposure-generating processes through which they operate upstream of Working-Life Exposure Systems, and by investigating how cumulative exposure histories may contribute, through biological and other pathways, to population health and trajectories of Human Functioning across the lifecourse.
Its distinctiveness lies not in any single concept, method, or scientific tradition, but in integrating these elements within a longitudinal, comparative, and systems-based explanatory architecture that makes their relationships empirically testable.
The shift is therefore in the level at which the epidemiological problem is formulated. SEWL moves from explaining the effects of working-life exposures once they are present to also explaining the systems and processes through which exposure configurations are generated, patterned, accumulated, and transformed across working lives and populations.
How does the organisation of working life become a population-health process?
The Vision
The vision is to advance SEWL from its emerging conceptual and empirical foundations into an increasingly rigorous, testable, and cumulative programme of population-health science. This requires developing the concepts, measures, data infrastructures, and analytical approaches needed to test its central explanatory propositions across working lives and populations.
Europe provides a particularly valuable scientific setting for this work. Its diversity of Labour Systems, welfare regimes, employment arrangements, regulatory environments, population cohorts, administrative registers, and research infrastructures creates exceptional opportunities for comparative investigation. This variation provides empirical leverage for examining whether and how differences in the organisation of working life are associated with differences in Working-Life Exposure Systems, population health, Human Functioning, and inequalities.
Comparative variation does not, by itself, establish causal effects of Labour Systems. Rather, it provides opportunities to test SEWL propositions across institutional and population contexts. Combined with longitudinal, multilevel, policy-evaluation, natural-experimental, and other appropriate designs, such comparisons can help distinguish contextual patterning from relationships that are more consistent with hypothesised SEWL mechanisms and pathways.
Europe therefore provides not simply a geographical base for SEWL, but a comparative scientific platform for developing, testing, challenging, and refining an emerging explanatory science with international scope.
Guiding Principles
SEWL integrates seven interconnected principles, grounded in established and developing scientific traditions, that together define its distinctive explanatory orientation, scientific scope, and approach to population-health prevention.
Working Life Is a Population-Health System
Working life is not simply a setting in which occupational exposures occur. It is a complex population-health system through which exposures, resources, protections, opportunities, and constraints are generated, patterned, and distributed across working lives and populations.
Labour Systems Generate and Pattern Working-Life Exposures
Labour Systems comprise the institutional, economic, organisational, technological, regulatory, and social arrangements through which working life is organised. They operate through exposure-generating processes that shape how multidimensional exposure patterns arise and are distributed across populations.
Exposures Operate as Systems across Working Lives
Working-life exposures rarely occur independently. Physical, chemical, biological, psychosocial, organisational, technological, behavioural, socioeconomic, and environmental exposures may co-occur, accumulate, and potentially interact over time. SEWL therefore investigates Working-Life Exposure Systems and their longitudinal exposure biographies, rather than treating exposures only as isolated or cross-sectional risk factors.
Working-Life Exposure Systems May Become Biologically Embodied
Cumulative working-life exposure histories may become biologically embodied through processes affecting physiological regulation, stress responses, inflammation, metabolism, biological ageing, and disease susceptibility. Biological Embodiment represents an important set of pathways within SEWL, but is not assumed to mediate all effects of working-life exposures. Working-Life Exposure Systems may influence functioning through biological and other pathways.
Human Functioning Is a Central Population-Health Phenomenon
SEWL extends attention beyond disease and injury to Human Functioning across physical, cognitive, psychological, social, and occupational domains. The scientific concern is not only whether people develop disease, but how working-life exposure histories contribute to the development, maintenance, decline, adaptation, and recovery of functioning across adult life.
Working Life Is a Lifecourse Process
Working-life exposures unfold through time. Their consequences may depend on timing, duration, accumulation, sequence, transitions, and prior exposure and health histories. Health and functioning may also influence subsequent employment, occupational selection, transitions, and exposure trajectories.
Prevention Must Extend Upstream
Prevention cannot be limited to modifying individual behaviour or controlling hazards after they have already been generated. By identifying the Labour-System arrangements and exposure-generating processes that structure Working-Life Exposure Systems, SEWL seeks to identify upstream leverage points for prevention alongside established workplace, occupational, clinical, and individual interventions.
Figure 3 presents a simplified overview of the guiding principles that define the scientific orientation of SEWL.
Figure 3
Why Now?
Working life is undergoing rapid transformation. Population ageing and longer working lives, technological change and artificial intelligence, new forms of employment and work organisation, demographic change, climate and environmental pressures, and persistent social and occupational inequalities are altering how work is organised and how exposures, resources, protections, opportunities, and constraints are distributed across populations.
These transformations are not simply creating new individual hazards. They are reconfiguring Labour Systems and the exposure-generating processes through which working-life conditions are produced and patterned, potentially changing the combinations, timing, duration, and accumulation of exposures across entire working lives.
Longer lives and changing employment trajectories also increase the importance of understanding how working-life conditions shape Human Functioning and the capacity to maintain, adapt, or recover functioning and participation over time.
Together, these developments create a scientific and public-health need to connect societal and Labour-System change with Working-Life Exposure Systems, population health, Human Functioning, and inequalities across the lifecourse. They also increase the need to identify where preventive action may intervene before harmful exposure patterns become established or accumulate across working lives.
The Logic of the Vision
SEWL reflects a set of related shifts in how working life can be investigated within population-health science. These shifts extend rather than replace established occupational and epidemiological approaches, placing specific hazards and workplace conditions within a broader explanatory architecture.
FROM Isolated Occupational Exposures → TO Working-Life Exposure Systems
From separate risk factors toward multidimensional Working-Life Exposure Systems in which exposures may co-occur, accumulate, and potentially interact, while changing over time.
FROM Workplace Conditions → TO Labour Systems and Exposure-Generating Processes
From examining working conditions primarily where they are experienced toward also investigating the Labour Systems and exposure-generating processes through which those conditions are produced, patterned, and distributed across working lives and populations.
FROM Exposure Snapshots → TO Exposure Biographies
From predominantly cross-sectional or episodic characterisation of exposure toward longitudinal exposure biographies that capture timing, duration, accumulation, potential interactions, transitions, and change across working lives.
FROM Disease and Injury Alone → TO Health, Human Functioning, and Functional Sustainability
From disease and injury as predominant endpoints toward a broader population-health perspective incorporating health, trajectories of Human Functioning, and Functional Sustainability across the lifecourse. Disease- and injury-specific epidemiology remains essential within this broader explanatory perspective.
FROM Predominantly Downstream Prevention → TO Prevention across Levels
From prevention focused predominantly on individual behaviour, workplace hazards, and proximal conditions toward an approach that also identifies upstream leverage points within Labour Systems and exposure-generating processes, while retaining established workplace, occupational, clinical, and individual interventions.
The Underlying Shift
Taken together, these shifts extend rather than replace hazard-specific occupational epidemiology. They move explanation from asking only what particular working conditions do to health toward also asking how systems of working-life organisation generate and pattern exposure configurations, how those configurations evolve across working lives, and how they may contribute to population trajectories of health and Human Functioning.
Figure 4 presents a simplified overview of these five shifts in explanatory perspective.
Figure 4
From Vision to Science
The SEWL vision defines the scientific problem and explanatory orientation. The Science section specifies its principal constructs and relationships, while the Research Programme translates that architecture into empirical questions, measurement strategies, analytical approaches, comparative designs, and testable propositions. Together, they move SEWL from scientific vision → explanatory architecture → empirical investigation.