Body function – the physiological functions of the body systems including psychological functions.

Impairment – problems with body function or structure.

Body structure – the anatomical parts of the body such as organs, limbs and their components.

Activity – the execution of a task or action by an individual

Activity Limitation – difficulties an individual might experience in completing a given activity.

Participation – involvement in a life situation.

Participation Restriction – problems an individual may experience with involvement in a life situation.