According to the World Health Organization " …Disabilities is an umbrella term, covering impairments, activity limitations, and participation restrictions.An impairment is a problem in body function or structure;an activity limitation is a difficulty encountered by an individual in executing a task or action;while a participation restriction is a problem experienced by an individual in involvement in life situations.Thus, disability is a complex phenomenon, reflecting an interaction between features of a persons body and features of the society in which he or she lives."