<qa>  What is the primary aim of this proposal?Therefore, the primary aim of this proposal is to examine the efficacy of an abbreviated course of DBT including all components of treatment compared to the evidence-supported 12 months of DBT. Our principal question is: How do the clinical outcomes of 6 months of DBT DBT-6 compare with the standard 12 months DBT-12 for the treatment of chronically self-harming individuals with BPD? Assessments will be conducted at pretreatment and at 3-month intervals until 24 months i.e., 3, 6, 9, 12, 15, 18, 21, and 24 months. 