An attempt is made to systematize the knowledge of identification. It is desirable to consider it from the qualitative and quantitative viewpoints, the id contents, and the effect of interpretation in order to show that there are different types of identification and counteridentification functioning on different levels. The modifications of the mechanism displayed depend on fixation and/or regression present at the time of interpretation. This clarifies the concept of the complementary countertransference of Racker, which shows how analysts react differently due to countertransference conflicts even though the patient's material is the same. Emphasis is given by the analyst himself. The analyst does not react differently in projective counteridentification since its intensity and specific qualities are predominant in the patient. Therefore, the author feels that at that time the emphasis comes from the patient.