• Description of P-E fit/misfit based on actual (e.g., observable) or self reported outcomes of P-E transactions

  • Outcome variables of P-E transactions (how well: ability is demonstrated, interface works, task is done) and associations (e.g., abilities are affected by the demands of the environment)

  • Dependent measures (e.g.: success/failure, ease/difficulty, independence/ dependence, satisfaction, comfort)