COM-B Model

A behaviour-change framework proposed by Michie, van Stralen, and West (2011) that identifies three necessary conditions for behaviour to occur: Capability (physical and psychological ability, including skills and knowledge), Opportunity (physical and social environment that makes the behaviour possible), and Motivation (reflective and automatic processes that energise and direct behaviour). Originally developed for health-behaviour interventions, COM-B is increasingly cited in accessibility and HCI research — especially work with older adults, disabled users, and people managing chronic conditions — as a lens for analysing why a technology is or is not adopted and where design interventions should target (e.g., scaffolding capability via low-barrier input, or opening opportunity via community access).