Table 1.

Overview of the theory domain framework and capability-opportunity-motivation-behavior model of behavior change.

Theoretical Domains Frameworka	Capability-Opportunity-Motivation Modelb
TDF	COM-B
A framework of 14 domains (higher-order theoretical constructs) identified as being implemented across behavior change interventions in varied contexts including health.	Model consisting of three components for behavior change. The authors suggest capability and opportunity influence motivation. Behavior change is a bi-directional process by which all components influence the occurrence of the desired behavior; the occurence of the behavior can conversely contribute to perceptions of the components.
Knowledge (procedural, condition)	Capability (p.5)
	‘Actual capacity to engage in the behaviour.’
Skills (competence, development)
Environmental context and resources (stressors, facilitators)	Opportunity (p. 5)
	All factors external to the individual that make the behavior possible or prompt it.’
Social influence (social pressure, support)
Intention (intrinsic motivation, commitment)	Motivation (p. 5)
	“Brain processes that energize and direct
Behavioural regulation (habits, monitoring)	Behaviour.”

^aCane et al. (2012). A subset of the 14 domains are listed here and examples of related constructs identified by Cane et al. are provided in (). For a full account of all domains, their constituent constructs, and how each domain corresponds to the COM-B model, refer to the original publication (pp. 8-10).

^bMichie et al. (2011). Definitions of each model component are the original authors. For a full account of each component, refer to the original publication.