Cognitive analytic therapy for borderline personality disorder: therapist competence and therapeutic effectiveness in routine practice.

This study sought to examine the competency of cognitive analytic therapy (CAT) delivered under routine care conditions and to identify the effectiveness of CAT for patients with borderline personality disorder (BPD). Ten cognitive analytic therapists in six National Health Service Trust sites treated 19 patients with BPD using the standard CAT BPD contract of 24 sessions plus four follow-ups. The methodology was small N repeated measures deign, with patients interviewed at the third follow-up session using the Change Interview.