IMPAIRMENT	DISABILITY	HANDICAP
Definitions	Abnormality of structure or function at the organ level	Functional consequences of an impairment	Social consequences of an impairment or disability
Examples	Speech, language, cognitive, or hearing impairments	Communication problems in context of daily life activities	Isolation, joblessness, dependency, role changes
Outcome Measures	Traditional instrumental and behavioral diagnostic measures	Functional status measures	Quality of life scales, handicap inventories, wellness measures

Source: International classification of impairments, disabilities, and handicaps. (World Health Organization, 1980)