An attempt is made to compare two psychoanalytic concepts which by ‘belonging’ to different psychoanalytic groups have come to be defined and used differently. The paper is also an inquiry into the possibility of a comparative psychoanalytic method. The two concepts are ‘repression’ and ‘splitting of the ego’ and an examination is made of the semantic similarities and differences. Some clinical material is offered that adds indicative clinical evidence to test the semantic comparison. The aim is to answer the question: Are the terms simply alternative ones for similar clinical phenomena? The paper offers one method which could provide an answer. It represents a general method for clarifying and maybe reconciling the differing points of view of competing psychoanalytic schools.