Abstract
The importance of differential diagnosis in using Masterson's (1976, 1981, 1985) techniques to treat patients with borderline personality is stressed because patients with certain other personality disorders do not respond well to the confrontational methods inherent in the Masterson approach. Among The other diagnostic categories likely to be confused with borderline personality Disorder are the schizoid personality and certain types of narcissistic personalities. Case histories of patients typical of each of these three personality types are presented, and issues in differential diagnosis are discussed.