THE SCIENCE AT A GLANCE
Systems Epidemiology of Working Life (SEWL) investigates working life as a population-health system. It examines how societal organisation shapes Labour Systems, how Labour Systems operate through exposure-generating processes to generate and pattern Working-Life Exposure Systems, and how the cumulative histories of these exposure systems may contribute, through biological and other pathways, to population health and trajectories of Human Functioning across the lifecourse.
Its explanatory architecture connects six principal constructs:
Societal Organisation
Labour Systems
Working-Life Exposure Systems
Biological Embodiment
Human Functioning
Functional Sustainability
This pathway represents the principal explanatory structure of SEWL, but not an obligatory linear causal sequence. Working-Life Exposure Systems may influence population health and Human Functioning through Biological Embodiment and other pathways. Prior health, selection, employment transitions, contextual conditions, and feedback can alter subsequent working-life exposures and trajectories of functioning.
SEWL integrates systems thinking, epidemiology, lifecourse and exposure-system approaches, causal reasoning, comparative research, and population-health science within a common architecture for investigating how the organisation of working life contributes to population health and Human Functioning over time.
Defining Systems Epidemiology of Working Life
Systems Epidemiology of Working Life (SEWL) is an emerging systems-based epidemiological science concerned with explaining how the organisation of working life generates population patterns of exposure, health, and Human Functioning across the lifecourse.
It treats working life not simply as a setting in which exposures occur, but as an exposure-generating population-health system in which Labour Systems shape the processes through which multidimensional exposure configurations are generated, patterned, accumulated, and transformed across working lives and populations.
SEWL investigates these Working-Life Exposure Systems longitudinally, including their exposure biographies, pathways of influence, and relationships with population health, Human Functioning, Functional Sustainability, and inequalities.
At its core is a fundamental scientific question: How does the organisation of working life generate population patterns of exposure, health, and Human Functioning across the lifecourse?
The Scientific Object
The scientific object of SEWL comprises the systems and processes through which the organisation of working life generates and patterns Working-Life Exposure Systems across working lives and populations. SEWL investigates how these exposure histories may contribute, through biological and other pathways, to population health and trajectories of Human Functioning across the lifecourse.
Six interconnected constructs provide the principal conceptual structure through which this object is investigated:
Societal Organisation
Societal Organisation encompasses the broader political, economic, institutional, technological, cultural, and environmental arrangements through which societies organise economic and social life. These arrangements provide the upstream context within which Labour Systems develop and change.
Labour Systems
Labour Systems comprise the institutional, economic, organisational, technological, regulatory, and social arrangements through which societies organise working life. They structure employment relations, working time, compensation, security, worker voice and autonomy, occupational protections, technological environments, and access to resources and opportunities.
Working-Life Exposure Systems
Working-Life Exposure Systems comprise multidimensional configurations of physical, chemical, biological, psychosocial, organisational, technological, behavioural, socioeconomic, and environmental exposures that may co-occur, accumulate, and potentially interact across working lives.
Biological Embodiment
Biological Embodiment describes processes through which working-life exposure histories may become incorporated into biological functioning over time. These processes may influence physiological regulation and dysregulation, biological ageing, disease susceptibility, health, and subsequent functional change. Biological Embodiment represents an important set of pathways through which Working-Life Exposure Systems may influence health and functioning, but is not assumed to mediate all such relationships.
Human Functioning
Human Functioning encompasses the capacities that enable people to live, participate, adapt, and perform across adult life, including physical, cognitive, psychological, social, and occupational functioning. SEWL treats functioning not merely as a consequence of disease, but as a multidimensional population-health phenomenon whose trajectories may involve development, maintenance, decline, adaptation, and recovery over time.
Functional Sustainability
Functional Sustainability refers to the longitudinal capacity to maintain, adapt, or recover Human Functioning and participation under changing demands, environments, and life circumstances. It therefore concerns the sustainability of functioning across time, rather than functioning at a single point in time or the presence or absence of disease alone.
The Scientific Pathway
The six principal constructs are connected through a central explanatory pathway:
Societal Organisation
Labour Systems
Working-Life Exposure Systems
Biological Embodiment
Human Functioning
Functional Sustainability
The pathway represents a directional explanatory structure rather than an obligatory linear causal sequence. Labour Systems operate through exposure-generating processes that shape how exposures, resources, protections, opportunities, and constraints are generated and patterned across working lives and populations. Exposures within these Working-Life Exposure Systems may co-occur, accumulate, and potentially interact, while the systems and their configurations may change over time, forming longitudinal exposure biographies.
Working-Life Exposure Systems may contribute to population health and trajectories of Human Functioning through Biological Embodiment and other pathways. These relationships are dynamic: prior health and functioning, selection, employment and occupational transitions, workforce participation, and changes in institutions, policies, technologies, and organisational practices may reshape subsequent working conditions and exposure trajectories.
The pathway unfolds across the lifecourse and across populations within changing historical, institutional, technological, social, economic, and environmental contexts. It also provides a framework for identifying potentially modifiable upstream processes and leverage points for prevention.
Figure 5 presents the SEWL systems pathway, including its dynamic processes, contextual influences, feedbacks, and potential points for upstream intervention.
Figure 5
The Scientific Architecture
SEWL integrates conceptual, methodological, empirical, and translational components, supported by enabling sciences, data resources, and analytical infrastructure.
Conceptual Foundations
The conceptual foundations define the principal constructs and explanatory relationships of SEWL, connecting Societal Organisation, Labour Systems, Working-Life Exposure Systems, Biological Embodiment, Human Functioning, and Functional Sustainability.
Methodological Architecture
The methodological architecture provides approaches for measuring and analysing complex working-life systems, including Labour System and exposure-system measurement, longitudinal and lifecourse methods, comparative and multilevel epidemiology, causal inference and policy evaluation, systems and network modelling, and computational approaches.
Empirical Investigation
Empirical investigation provides evidence for testing, challenging, and refining SEWL propositions through longitudinal, comparative, biological, population-based, and occupational research.
Translation and Prevention
Translation and prevention connect scientific explanation with action through evidence synthesis, intervention and policy development, stakeholder engagement, implementation, and evaluation.
Phenomena to Be Explained
Principal phenomena and outcomes include population health, Human Functioning, Functional Sustainability, and population inequalities, alongside related outcomes such as work ability, workforce participation, and premature workforce exit.
Enabling Science and Infrastructure
SEWL draws on occupational and population epidemiology, exposure-system science, lifecourse epidemiology, systems and network science, computational modelling and artificial intelligence, together with population data and linkage infrastructures, to support its conceptual, methodological, and empirical development.
These components operate within cross-cutting systems properties and contextual conditions, including multilevel relationships and interactions, temporal dynamics, heterogeneity, feedback and adaptation, and variation across historical, institutional, workplace, organisational, population, and environmental contexts.
Figure 6 presents the integrated scientific architecture of SEWL.
Figure 6
Scientific Domains
Working-Life Exposure Systems are multidimensional. SEWL therefore investigates how exposures, resources, protections, opportunities, and constraints are generated and patterned across six interconnected domains of working life. These domains are analytically distinguishable but interdependent, and their configurations, co-occurrence, timing, accumulation, and potential interactions contribute to the exposure systems experienced across working lives and populations.
Occupational and Environmental Conditions
Physical, chemical, biological, ergonomic, safety, and environmental conditions encountered through work, including established occupational hazards and emerging environmental risks.
Work Organisation and Psychosocial Conditions
The organisation and experience of work, including workload and demands, control and autonomy, scheduling and working time, recovery, social relations, organisational climate, and psychosocial stressors and resources.
Employment Relations and Economic Security
Employment arrangements and associated material conditions, including employment security, contractual arrangements, compensation and benefits, income adequacy, career trajectories, and access to employment-linked resources and protections.
Technology, Automation, and Algorithmic Governance
Technological processes that reshape work and exposure, including automation, artificial intelligence, digital platforms, monitoring and surveillance, algorithmic management, task transformation, skill demands, and human–technology interaction.
Institutional Protection and Worker Voice
Regulatory and institutional arrangements shaping worker protection and participation, including occupational safety and health systems, labour regulation, collective representation, worker voice, enforcement, social protection, and related governance arrangements.
Work–Nonwork Interface
Processes through which working life interacts with conditions beyond the workplace, including time use and recovery, family and caregiving demands, mobility and commuting, financial strain, social participation, and other work-mediated influences on nonwork life.
Together, these domains provide a multidimensional framework for investigating how Labour Systems, operating through exposure-generating processes, generate and pattern configurations of exposures, resources, protections, opportunities, and constraints across working lives and populations.
Figure 7 presents a simplified overview of the six interconnected scientific domains through which Working-Life Exposure Systems are constituted and patterned.
Figure 7
Scientific Foundations and Integration
SEWL builds on complementary scientific traditions spanning occupational epidemiology, population health and social epidemiology, lifecourse and ageing research, systems science and complex systems, exposome science, social and policy sciences, and the science of human-functioning. Together, these traditions provide established knowledge, concepts, and methods for investigating exposures, population patterning and inequalities, temporal processes, complex systems, institutions and policy, and health and functioning across the lifecourse.
Building on these foundations, SEWL integrates conceptual developments concerned with the Working-Life-Exposome (WLE), Epidemiology of Working Life (EWL), Work-Structured Ageing (WSA), Exposure-System Science (ESS), and Functional Sustainability within a common explanatory architecture.
The contribution of SEWL lies not in presenting these scientific traditions as new, but in integrating and extending them around a specific epidemiological problem: how the organisation of working life generates and patterns Working-Life Exposure Systems and how these may contribute to population health and Human Functioning across the lifecourse.
Figure 8 presents a simplified overview of the relationship between established scientific traditions, related conceptual developments, and their integration within Systems Epidemiology of Working Life.
Figure 8
Fundamental Scientific Questions
The scientific architecture of SEWL gives rise to seven fundamental questions about the organisation of working life and its consequences for populations:
Exposure Generation
How do Labour Systems, operating through exposure-generating processes, generate, pattern, and modify Working-Life Exposure Systems across populations and over time?
Exposure-System Dynamics
How do Working-Life Exposure Systems co-occur, accumulate, potentially interact, and change across working lives, and which configurations are most consequential for population health and Human Functioning?
Biological Embodiment
Through what biological processes may working-life exposure histories become embodied over time, and how may such embodiment contribute to population health and trajectories of Human Functioning?
Inequality
How do Labour Systems differentially distribute exposures, protections, resources, and opportunities, and how may this patterning contribute to population inequalities in health and Human Functioning?
Comparative Labour Systems
How do Working-Life Exposure Systems, population health, and trajectories of Human Functioning vary across Labour Systems and societal contexts, and which features of those systems may help explain these differences?
Functional Sustainability
How are Working-Life Exposure Systems and exposure biographies related to the capacity to maintain, adapt, or recover Human Functioning and participation under changing demands and circumstances across the lifecourse?
Prevention
Which potentially modifiable upstream systems, policies, protections, and organisational arrangements may represent leverage points for preventing harmful exposure patterns and promoting population health, Human Functioning, and Functional Sustainability?
Together, these questions translate the scientific architecture into a testable empirical research agenda spanning exposure generation and dynamics, Biological Embodiment, inequalities, comparative Labour Systems, Functional Sustainability, and prevention.
Figure 9 presents a simplified overview of the seven fundamental scientific questions of SEWL.
Figure 9
From Science to Research
The scientific framework defines what SEWL seeks to explain and the principal constructs, relationships, and questions through which it can be investigated.
The next step is empirical: translating this framework into research designs, measurement strategies, analytical methods, comparative studies, and testable propositions through which SEWL can be examined, challenged, and refined.