Historically, interventions designed to impact the lives of disabled people were predicated upon deficits-based models of disability. This began to change with the introduction of World Health Organization (WHO) frameworks, particularly the International Classification of Function (ICF), that emphasized that disability could only be understood in the context of interactions among health, environmental factors, and personal factors and by examining the impact of such factors on a person's activities and participation. The ICF identified personal factors as among the elements of a...