There is a need to develop ways to articulate and measure complex therapeutic interventions themselves. This is especially true of those treatment approaches which integrate human relationships, collaborative problem-solving, and the targeted doing of unique, personally relevant occupations. Occupational therapy is a health profession characterized by such interventions. The capacity to delineate key process variables may lead to credible examination of process-outcome relationships. Ultimately, results from the proposed study may provide information needed to further establish patient outcomes from occupational therapy interventions.