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International Classification of Impairment, Disability and Handicap (ICIDH):
Impairment - any loss or abnormality of psychological, physiological or anatomical function.
Disability - any restriction or lack (resulting from an impairment) of ability to perform an activity in the manner or within the range of activity considered normal for a human being.
Handicap - a disadvantage for a given individual that limits or prevents the fulfilment of a role that is normal for that individual.