A concrete formulation of focus is proposed that in structure and use is suitable for individual as well as couples and family therapy. The concept of coevolution (Willi 1985, 1991) forms a basis for the supposition that important personal developments are realised in human relationships. The development of one person is challenged, taxed, or hindered by the development of other persons. The formulation of a coevolutional focus consists of four steps: 1) The context of the relationship in which the current conflict emerges; 2) The identification of delayed stages of development; 3) The personal and interactional conditions which block this development; 4) Concrete changes which make the progress in the intended development recognizable. The focus in couples and family therapy integrates the impending development of the participants in their collusive interactions.