Clinical psychodiagnostics has its origin in medical practice, and emerged historically out of psychiatry. The implications are thus that clinical psychodiagnostics not only developed out of a particular type of knowledge, but also that it possesses a very specific relationship with the object of this knowledge, namely, the patient. The contribution of this relationship to the doctor’s success or failure with his patients, beyond the mere question of his or her knowledge, is considerable, because it is precisely in and through this relationship—and never apart from it—that such knowledge operates.