Engaged for more than twenty years in clinical research on personality disorders, the author focused, in his earlier work, on adolescents, particularly those seen in an inpatient setting; his more recent findings come from his experience in treating adults in his private practice, using the theoretical and therapeutic model he had developed in treating borderline adolescents. This is the same theory and technique he reports having taught to over a hundred psychiatrists with excellent results. Masterson's present study contrasts a technique derived from a developmental model and "object-relations theory" with one derived from a conflict-drive psychoanalytic model. Favoring the former, Masterson further dichotomizes the issue by