DISCUSSION: Dr. Francis Baudry felt that Dr. Pfeffer's work on the modes of obsessional thinking was particularly valuable because of the role that thinking disturbances play in obsessive disorders. There is, however, a blurring of boundaries between some of the obsessional traits mentioned by Dr. Pfeffer. A sharper differentiation could be made between disorders of thought and patterns of communication. Dr. Pfeffer has written mostly about the latter. The reintroduction of the topographic model may assist us in making a better differentiation between resistances and reluctances. The adaptive aspect of resistances must be dealt with first from a technical point of view.