Some of the psychological theories and constructs which you may have come across that have been used to study healthcare professional practice for many decades include: Theory of Planned Behaviour; Social Cognitive Theory; Self-Regulation Model; Learning Theory; Implementation Intentions; Knowledge; Attitudes; Behaviour Model; Precaution-Adoption-Process Model.. Other models and frameworks used to study healthcare professionals and implementation include Promoting Action on Research Implementation in Health Services (PARIHS); PRIME Theory; Burnout theories. These can be split and summarised in many ways. COM-B is one way of summarising these and even more theories and different determinants. It was systematically developed by health psychology colleagues at University College London to help make psychology more accessible to non-psychologists. COM-B forms part of a user-friendly intervention development method called the Behaviour Change Wheel which has been applied to helping professionals change several key behaviours. Other comprehensive approaches for intervention development include Intervention Mapping.
For more details about the Behaviour Change Wheel and COM-B model, see http://www.behaviourchangewheel.com/ or Michie, S., Van Stralen, M. M., & West, R. (2011). The behaviour change wheel: a new method for characterising and designing behaviour change interventions. Implementation science, 6(1), 42.