The past decade has seen widespread research on systematic evaluation of the competence of health professionals. Such activity usually has been carried out in accordance with the prevailing psychological paradigms, in which competence is represented as a trait, or as an intrapsychic factor. However, even when competence has been delimited as problem-solving, the research generally identified a strong situational influence on performance. In this article are assembled a set of diverse but complementary arguments for dispensing with the conventional representations of professional competence. In their place is proposed a relational model in which competence in health professions is seen as the aggregated adaptations of practitioners to the set of special social circumstances that obtain within the situational boundaries of their profession. It is argued that a thorough understanding of the content of professional situations is a necessary prerequisite for successful evaluation of professional competence, since competent behavior is lodged in a network of probabilistic relationships with the surroundings. Also discussed are selected procedural implications of this new model for the conduct of investigations of professional situations.