Table 5.

Mapping of sub-themes against the COM-B System [37]

COM-B				Sub-theme
Behaviour System	Sources of behaviour	Intervention functions	Policy categories
Capability	Psychological	Modelling Environmental restructuring Restrictions Education Persuasion Incentivisation Coercion Training Enablement	Fiscal measures Guidelines Environmental/ Social planning Communication/ Marketing Legislation Service provision Regulation	Improved awareness of cost considerations Consult with senior doctors Consult with radiology staff Clinical decision support tools Personal experience Professional judgement Professional responsibility Clinician gestalt Model consultants and more experienced doctors Ongoing training National health system Resource considerations Bed flow considerations Patient safety Patient management Medico-legal issues Holistic patient-centred care
	Physical
Opportunity	Social
	Physical
Motivation	Reflective
	Automatic