The effects of formal assessment and feedback on physician performance are influenced by the source and duration of feedback. Other factors, such as physicians' active involvement in the process, the amount of information reported, the timing and amount of feedback, and other concurrent interventions, such as education, guidelines, reminder systems and incentives, also appear to be important. However, the independent contributions of these interventions have not been well documented in controlled studies. It is recommended that the designers of future theoretical as well as practical studies of feedback separate the effects of feedback from other concurrent interventions.

There are few well-documented studies of instruments that can be used to measure professionalism in formative or summative evaluation. When evaluating the tools described in published research it is essential for faculty to look critically for evidence related to the three fundamental measurement properties of content validity, reliability, and practicality.