Unification in the MoveTips Unified Functional Ontology: A Whole-Person Conceptual Framework Centered on Human Function and Functional Engagement

This paper examines what “unification” means in the MoveTips Unified Functional Ontology (MUFO). It defines human function as the body’s capacity to be appropriately engaged to meet internal and external demands, and argues that unification is neither the mechanical aggregation of disciplinary knowledge nor a prescription of how the body ought to operate. Rather, unification means using one coherent semantic system to describe human functions as they exist within an integrated whole person, together with their functional engagement. The framework unifies six connected domains: (1) the scope and completeness of human functions; (2) relations between internal and external demands and the human functions required to meet them; (3) realization relations among human function, bodily structure, and bodily process; (4) functional engagement—whether each required function actually operates under specified demands, conditions, and time; (5) coordination, compensation, boundaries, state, time, and change; and (6) the representation of these facts for the same person across conditions and over time. The paper distinguishes functional-capacity problems from functional-engagement problems and proposes a shared semantic frame for medicine, rehabilitation, exercise, psychology, and nutrition while preserving professional scopes and evidence boundaries. MUFO is presented as a conceptual ontology framework and research proposal. It is not a clinical guideline, diagnostic system, treatment recommendation, or established international standard.