Definition and descriptions of Impairment, Disability and Handicap: WHO in 1980, draws a three fold distinction between the Impairment, Disability and Handicap.

Impairment:

Impairment is any loss or abnormality of psychological, physiological or anatomical structure or function.

Disability:

Disability is any restriction or lack of ability to perform an activity in the manner or within the range considered normal for a human being. Disability is resulting from an impairment.

Handicap:

Handicap is a disadvantage for a given individual, that prevents the fulfillment of a role that is considered normal (depending on age, sex, social, culture factors) for that individual. Handicap is resulting from an impairment or disability.

References:

⇒ WHO (World Health Organisation)

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Definition and descriptions of Impairment, Disability and Handicap