The three disorders of Cluster A—paranoid, schizoid, and schizotypal—differ in several important ways from the disorders of the dramatic cluster (Cluster B) and the anxious cluster (Cluster C). Patients with Cluster A disorders are more disinclined to interact with others or to be comfortable with intimacy than those in the other clusters, with the exception of the avoidant type. Those with Cluster A disorders are apt to be experienced by other people as not fitting in well socially and are usually not as attention-grabbing as patients with Cluster B disorders (especially borderline and antisocial disorder). Finally, unlike the inhibited persons who compose the ranks of Cluster C and who are more amenable to psychodynamic therapies and to psychoanalysis itself, Cluster A patients, many of whom are quite guarded and not so self-revealing, are less often treated by psychodynamic approaches. These factors would seem to account for the sparseness of the psychotherapeutic literature on the Cluster A disorders.