The method of free association, especially in its self-observative aspect, may be seen as a useful criterion for differentiating among various clinical approaches to psychoanalysis, not only as they evolved in the course of its history but also as they are being practiced today. It is suggested that it may be of some relevance to view the existing variants of clinical psychoanalysis as being based upon differing emphases on one or another of the basic operational concepts, such as free association, interpretation, and the mental disposition of the analyst.