This paper discusses the problematic interpersonal cycles that arise between therapist and patient in the treatment of Personality Disorders. Interpersonal cycles are approached from three theoretical levels. First, we present the constructs that allow us to understand and describe the process and call it this theoretical level: theory of facts. In the second theoretical level, which we call theory of the cure, we discuss the implications that the question of interpersonal cycles has on the therapeutic process. Finally, we will discuss the ways in which it is possible to make effective the therapeutic potential that the occurrence of interpersonal cycles entails. This third level concerns the theory of technique.