One of the principal aims of adolescence is the development of the capacity to think for oneself. The authors explore the difficulties caused by disturbances of thinking in borderline adolescents, pointing out the role that the analyst can take in promoting better functioning of their patients’ mental processes. Two cases are explored, one through a supervision and the other through direct clinical experience. Both illustrate the efforts of the analyst to carry out ‘management in the area of thinking’ with those borderline patients who have not received help from their parents to think, and still need to be shown how mentation takes place. The authors propose some changes in technique in order to implement this improvement, including sharing with the patient the way in which the analyst thinks about him. Thinking itself can be an important integrating factor for these patients.