Professional competence in psychology and other health care professions is fluid, contextual, and vulnerable to degradation over time. Moreover, psychologists-üke all human beings-are often notably ineffective in self-evaluating competence. We introduce the competence constellation model (CCM) as a communitarian strategy for ensuring optimal functioning and protecting psychologists from unintended and unrecognized problems of professional competence. A competence constellation is defmed as a cluster of relationships with people who take an active interest in and engage in action to advance a professional's well-being and professional competence. Salient characteristics of a competence con.stellation include diversity, strength of ties, and intentional effort toward its development. Key structural elements include the inner core, collégial community, coUegial acquaintances, and the professional culture. We conclude with several implications of the CCM, as well as recommendations for the training of psychologists, credentiaHng and regulatory bodies, and modification of the protession's ethical principles and stajidards.