Compare methods

	Person-Environment Fit (Disability)	CHIEF Environmental Barriers
Field	Disability Studies	Disability Studies
Family	Process / pipeline	Latent structure
Year of origin	2001	2004
Originator	Ecological models of aging and disability (e.g., Lawton & Nahemow competence-press); aligned with the WHO ICF	Gale G. Whiteneck and colleagues (Craig Hospital)
Type	Analytic framework treating disability as misfit between personal capacity and environmental demand	Self-report instrument quantifying environmental barriers by frequency and magnitude
Seminal source	World Health Organization. (2001). International Classification of Functioning, Disability and Health: ICF. Geneva: WHO. ISBN: 9789241545426	Whiteneck, G. G., Harrison-Felix, C. L., Mellick, D. C., Brooks, C. A., Charlifue, S. B., & Gerhart, K. A. (2004). Quantifying environmental factors: a measure of physical, attitudinal, service, productivity, and policy barriers. Archives of Physical Medicine and Rehabilitation, 85(8), 1324-1335.
Aliases	Competence-Press Model, Demand-Capacity Fit Framework, Ecological Disability Fit Model, Person-Environment Misfit Analysis	CHIEF, Craig Hospital Environmental Inventory, Frequency-Magnitude Barrier Scale, Environmental Factors Inventory
Related	3	3
Summary	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.	The Craig Hospital Inventory of Environmental Factors, known as CHIEF, is a self-report instrument that quantifies the environmental barriers people with disabilities encounter in daily life. Developed by Whiteneck and colleagues in 2004, it operationalizes the environmental-factors component of the WHO ICF, which holds that disability arises from the interaction between a person and their surroundings rather than from impairment alone. CHIEF asks respondents about barriers across five domains — physical and structural, attitudinal and support, services and assistance, productivity, and policy — and for each potential barrier it captures two things: how often the barrier is encountered (frequency) and how big a problem it is when encountered (magnitude). The defining feature of the instrument is that these two ratings are multiplied into a frequency-by-magnitude product, so that a barrier counts for more if it is both common and serious. These products are averaged into domain scores and an overall score, giving a quantitative profile of the environmental obstacles a person faces.