Arnold Bakker is Professor of Work and Organizational Psychology at Erasmus University Rotterdam and one of the most cited researchers in occupational health psychology. His contribution to the flow lineage is the work-related-flow-inventory (WOLF, 2008) — the first psychometric instrument designed and validated specifically for measuring flow in workplace contexts. Prior to WOLF, researchers studying occupational flow were forced to use instruments validated in sport or student populations, raising serious generalizability concerns.
The gap WOLF filled
By 2008, flow research had a well-established measurement tradition in sport (Jackson's flow-state-scale and dispositional-flow-scale) and laboratory settings (Rheinberg's flow-short-scale), but no instrument validated for the occupational setting's distinctive features: tasks with external deadlines, role demands, variable autonomy, and the mixed intrinsic-extrinsic motivation structure of paid employment. Bakker argued that applying sport-validated instruments to workers without revalidation introduced systematic measurement error.
WOLF's three dimensions — absorption, work enjoyment, and intrinsic work motivation — were derived from factor analysis of occupational samples rather than assumed from prior theoretical frameworks. This bottom-up approach found that the three-factor structure fit occupational flow better than the nine-factor model csikszentmihalyi developed from sport and creative domains, suggesting that the phenomenology of work flow may be somewhat simpler or differently structured than leisure-domain flow.
Connecting flow to Job Demands-Resources
Bakker embedded WOLF within the Job Demands-Resources (JD-R) model, which he had developed earlier with Evangelia Demerouti. In the JD-R framework, job resources (autonomy, feedback, support) predict engagement and buffer against burnout, while job demands (workload, emotional demands) predict exhaustion when resources are insufficient. Bakker's flow research located work-related flow specifically within the resources dimension: flow is most likely when job resources are high enough to support full absorption without the constant regulatory attention that high demands require.
This theoretical integration was strategically important for the flow lineage. It gave occupational psychologists a framework in which to explain when and why flow occurs at work — not merely that it does — and connected flow to the large existing literature on job design, burnout prevention, and employee well-being. pink's autonomy-mastery-purpose framework and demarco and lister's conditions in peopleware can be mapped onto the JD-R model: autonomy and mastery opportunity are job resources, and their presence predicts work-related flow.
Distinguishing flow from engagement
Bakker has been careful to distinguish work-related flow from work engagement, a related but distinct construct. Work engagement is a relatively stable affective-motivational state characterized by vigor, dedication, and absorption; flow is a momentary peak state of complete absorption. Engagement is the dispositional baseline; flow is the acute episode. This distinction parallels jackson's FSS (state) / DFS (dispositional) distinction in sport, but Bakker applied it specifically to the occupational context where the conflation of "engaged employees" with "employees experiencing flow" is common in management literature.
Position in the lineage
Bakker's work bridges clinical occupational psychology and flow science in a way that neither the sport psychology tradition nor csikszentmihalyi's mainstream research program fully accomplished. He gives organizations empirically validated instruments and theoretical frameworks for thinking about when knowledge workers and professionals experience flow — which is the central applied question the flow KB addresses for software and organizational contexts. His JD-R integration connects flow to practical levers (autonomy, feedback, skill-challenge calibration) that managers can adjust.