• Person- body structure, body function, and their associated capacities.

  • Press- contextual factors that place demands on the individual and contribute to differences between capacity and actual performance.

    • Individual attributes

    • Physical attributes of workspaces, products, and interfaces

    • Social attributes

    • Task requirements

    • Organizational attributes

    • External attributes

  • Performance- engagement in activities and participation in society as measured by what an individual actually does.