Model of Human Occupation (MOHO)

The Model of Human Occupation (MOHO) is an occupation-focused conceptual model that explains how people choose, organize, and carry out their everyday occupations. It conceives of the person as composed of three interrelated elements, volition, habituation, and performance capacity, which operate in continuous interaction with the environment to shape occupational behaviour, identity, and competence.

Definition

The Model of Human Occupation is a conceptual model of practice that explains occupational behaviour as the product of the interaction among a person's volition, habituation, and performance capacity with the physical and social environment, giving rise to occupational identity, competence, and adaptation.

Scope

This entry describes the core constructs of MOHO, the role of the environment in the model, and the way the model accounts for the development and change of occupational behaviour over time. It treats MOHO as a conceptual model within occupational therapy theory and is reference-educational; it does not provide individualized assessment procedures or treatment instructions.

Core questions

• What are volition, habituation, and performance capacity in MOHO?
• How does the environment influence occupational behaviour in the model?
• How does MOHO explain occupational identity and competence?
• How does occupational behaviour develop and change over time according to MOHO?

Key concepts

• Volition (personal causation, values, interests)
• Habituation (habits and internalized roles)
• Performance capacity (objective and lived/subjective body)
• Environment (physical and social)
• Occupational identity and occupational competence
• Occupational adaptation

Key theories

Model of Human Occupation

Occupational behaviour arises from the interaction of three components of the person, volition (motivation for occupation), habituation (patterning of behaviour into roles and routines), and performance capacity, together with the environment, producing occupational identity, competence, and adaptation over time.

Mechanisms

MOHO portrays the person as comprising three interacting subsystems. Volition concerns the motivation for occupation and includes personal causation, values, and interests. Habituation organizes behaviour into the semi-automatic patterns of habits and the internalized expectations of roles. Performance capacity refers to the underlying physical and mental abilities for doing, understood both objectively and through lived, subjective experience. These elements interact continuously with the physical and social environment, which can afford or constrain occupational engagement. Over repeated cycles of engagement, this interaction shapes occupational identity (a sense of who one is as an occupational being) and occupational competence (the degree to which one sustains a pattern of participation), with occupational adaptation emerging as identity and competence develop in a supportive environment.

Clinical relevance

MOHO offers practitioners a structured way to consider motivation, habits and roles, capacities, and environmental context when understanding a person's occupational participation, and it is associated with a family of assessments developed to operationalize its concepts. As a reference framework, it describes constructs for understanding occupational behaviour; the choice and use of any assessment or intervention for an individual lies outside the scope of this educational entry.

Evidence & guidelines

MOHO is among the most widely used and most extensively elaborated conceptual models in occupational therapy, supported by foundational model papers, an established body of associated assessment tools, and successive editions of its core text. The literature on the model is predominantly conceptual and assessment-development work rather than controlled trials of the model as an intervention.

History

The Model of Human Occupation was introduced by Gary Kielhofner and Janice Burke in a series of papers in 1980, building on earlier occupational behaviour theory associated with Mary Reilly. It grew through subsequent revisions into a comprehensive model with an accompanying set of standardized assessments, and it has been maintained and extended across multiple editions of its principal textbook, including editions edited by Renée Taylor after Kielhofner's death.

Key figures

• Gary Kielhofner
• Janice Burke
• Renée Taylor

Seminal works

• kielhofner-burke-1980

Frequently asked questions

What are the three main components of the person in MOHO?

Volition (motivation for occupation, including personal causation, values, and interests), habituation (habits and internalized roles), and performance capacity (the underlying abilities for doing, understood both objectively and as lived experience).

What do occupational identity and occupational competence mean in MOHO?

Occupational identity is a cumulative sense of who one is and wishes to become as an occupational being, while occupational competence is the extent to which a person sustains a pattern of occupational participation consistent with that identity.