Person-Environment Fit (Disability)

Person-environment fit is an analytic framework that treats disability not as a property of the individual but as a misfit between a person's capacity and the demands their environment places on them. Rooted in ecological models of aging and disability — most famously the competence-press model, in which behavior depends on the balance between personal competence and environmental press — it aligns closely with the biopsychosocial conception of the WHO ICF, where disability emerges from the interaction of the person and contextual factors. The framework asks, for any activity or life situation, whether the environment demands more than the person can supply: when demand exceeds capacity there is misfit and disability is expressed, and when demand is within capacity there is adequate fit and participation proceeds. Crucially, this reframing implies that misfit can be reduced from either side — by raising the person's capacity or, often more powerfully, by lowering environmental demand and adding support. The practical thrust is to target interventions on the environment, not only on remediating the person.