Once upon a time it was assumed that BPD couldn't be treated effectively with CBT. Many assumed that only psychodynamic treatment was appropriate for this problem.

Then Marsha Linehan developed Dialectical Behavior Therapy and conducted an actual outcome study that showed that it worked. This was a first, the psychodynamic folks hadn't actually gotten around to doing controlled outcome studies. For a number of years, people assumed that DBT was the way to treat BPD.

Now the floodgates are opening! The October, 2006 edition of the Journal of Personality Disorders includes four articles on CBT with BPD. Three of them are reports on the BOSCOT study testing Kate Davison's approach to treating BPD and the other is a test of her manualized CT for deliberate self-harm in BPD.

Also in the works, there's an open clinical trial of CT for BPD which I haven't seen in print yet but which produced interesting results and Arnhoud Arntz is conducting an outcome study on yet another approach to CBT with BPD which combines CT with Jeff Young's Schema Therapy. It looks like we'll have four different approaches to CBT with BPD.