On the basis of a review of 4 contemporary models of brief integrative psychotherapy-short-term restructuring psychotherapy, cognitive behavioral analysis system of psychotherapy, time-limited dynamic psychotherapy, and a therapy integrating cybernetic systems, existential-phenomenology, and solution-focused narrative approaches-a set of common factors is articulated and a distinction between unitary and dialectical common factors is introduced. That therapy is essentially experiential and that a necessary agent of change is the patient's experience, particularly of new, positive interpersonal experiences, is a major area of agreement among the models. The paper concludes with a discussion of a transformational model of mutual influence, which supports a therapeutic stance that goes beyond responsiveness, to explore therapist initiative in the co-construction of dyadic interpersonal patterns.I have always maintained that brief therapy is therapy, only more so: It is human nature to try make every moment count when confronted with finiteness. Although we all know that our lives are time limited, so to speak, we most often live as if we were immortal until our attention is rudely drawn to the fact that matters are otherwise. Often, traditionalread nonbrief-therapy proceeds as if time did not exist. Brief therapy "pulls" for full engagement and mindfulness of time. There is no reason to hold back or bide one's time: The condensed course almost mandates that therapists be disciplined, pragmatic, nongrandiose, and hard working from moment to moment. In graduate school, some supervisors, kindly seeking to reassure neophytes, say, "There's always next session." The ethos of brief therapy is otherwise: "Work as if there were no next session."