Increasingly, professionalism has been recognized as a core competency for health service professionals and is the domain in which vexing competence problems are observed in trainees. We begin by describing manifestations of problems of professionalism in accord with the values that fall within the rubric of this multifaceted construct. We provide an approach for evaluating problems of professionalism and discuss intervention for trainees with mild, moderate, or severe problems in this domain. We propose implications for training focused on enhancing the (...) culture of programs; bolstering the education, guidance, and mentoring provided related to professionalism; and encouraging best practices for addressing trainees with problems of professionalism. We conclude by sharing ideas about defining professionalism, identifying problems of professionalism, strengthening our approach to assessing professionalism and intervening when problems are evident, developing strategies for preventing professionalism problems, and ensuring that psychologists take seriously their responsibility to address professionalism concerns with colleagues. (shrink)