The Beginning…. (MOHO) is a conceptual model of practice that evolved from Reilly's Occupational Behavior Model and General System Theory. Gary Keilhofner was a student of Mary Reilly who originally created this model as a Master's thesis in 1975. Within five years, Kielhofner and his colleagues published MOHO for the first time. What is it? The Model of Human Occupation is a conceptual practice model which is defined as "… a set of evolving theoretical arguments that are translated into a specific technology for practice and are refined and tested through research" (Kielhofner, 2002, p. 3). Focus Systemic, holistic approach for persons of varying needs and populations across the lifespan Stresses the importance of the mind/body connection in its depiction of how motivation (internal) and performance of occupation (external) are interconnected Human occupation is described as the "doing" of work, play, or activities of daily living within a temporal, physical, and sociocultural contexts. Interactive nature between the person and his environment and how this relationship contributes to one's source of motivation, pattern of behavior, and performance. PERSON - redefined for practice Kielhofner's theoretical view of the person is very comprehensive.
Variables include one's motivation, behaviors, and performance. All 3 inter-relate to form a person's identity. Kielhofner has specifically grouped these variables into 3 subsystems that he calls 1) volition, 2) habituation, and 3) performance capacity. Volition Subsystem Volition is the source of motivation for occupation. Habituation Subsystem Habituation refers to the process by which occupation is organized to patterns or routines. Performance Subsystem Performance capacity refers to the physical and mental abilities that underlie skilled occupational performance. This subsystem is also called the mind-brain-body