Abstract: This presentation will address a longstanding problem in the field of psychology, that of lacking an adequate explication of what is arguably our central concept as a “science of behavior,” the concept of “behavior” itself. In the presentation, which of necessity must be very brief, I will try to touch on three matters. These are: (a) presenting a conceptual formulation of the concept “behavior”; (b) discussing and defending the somewhat unusual (within psychology) nature of this formulation; and (c) relating why having some adequate formulation, whether it be this one, Dr. Henriques’, or some other, is important for a science of psychology. Issues concerning matters of subjectivity, relationality, meaningful interpretation, historical ontology, and the integrative power of the present formulation will be touched upon. The session will conclude with Dr. Brill, Dr. Henriques, and myself discussing issues raised by our formulations.