[Static to sequential plan analysis]

The method of Plan Analysis helps for a better understanding of the interactional engagement of the client within the client-therapist relationship. In spite of this interactional conceptualization of the method, plan analysis produces only a statical diagnosis of interpersonal intentions and plans. In order to realize a dynamical analysis of the client-therapist relationship, the method has to be modified. The steps of this modification will be explained. The result is an idiographic, discovery oriented strategy, called "Sequential Plan Analysis" (SPA), which can be used to do single case analysis of psychotherapy processes. SPA produces sequential patterns of interactional plans (nominal data) as well as quantitative time series.