Participants will complete 1.5 hr group sessions once per week for 12 weeks of Skills Training in Affective and Interpersonal Regulation (STAIR). Participants will complete self-report measures pre, post, and at one month intervals.

First, participants will remain on the DBT waitlist for 12 weeks receiving no active intervention and will complete pre and post-measures. Then participants will complete 1.5 hr group sessions once per week for 12 weeks of Skills Training in Affective and Interpersonal Regulation (STAIR). Participants will complete self-report measures pre, post, and at one month intervals.

Clinician led session that hones in on a particular deficit within these skills, including identifying and labeling emotions, managing emotions, tolerating distress, accepting feelings and increasing positive emotions, identifying trauma-based interpersonal schemas, identifying conflict between trauma-related feelings and goals, role plays surrounding issues of power and control, and role-plays related to developing flexibility in interpersonal situations involving power differentials. STAIR is a cognitive-behavioral treatment that addresses emotion regulation and interpersonal difficulties and their impact on daily living.

This number will include those who attend the 12 weeks of STAIR with no more than three missed sessions

Calculate the total score for each participant on the Client Satisfaction Questionnaire-8, and find the average of those scores. Scores are summed across items. Items 2, 4, 5, and 8 are reverse scored. Total scores range from 8 to 32, with the higher number indicating greater satisfaction.

Calculate the number of patients who attended each week of the STAIR treatment.

Problems with emotion regulation will be assessed using the Difficulty in Emotion Regulation Scale. Total score ranges from 36 to 180. Higher scores indicate greater problems with emotion regulation.

The severity of posttraumatic stress disorder symptoms is measured using the PCL-5. Items are rated using a 5-point likert scale ranging from 0 "not at all" to 4 "extremely." All 20 items are summed to obtain a total score (0 to 80), higher scores indicate higher severity of PTSD symptoms.

Using the Borderline Evaluation of Severity Scale comprising of 15 items using a likert scale rated from 5 "Almost Always" to 1 "Almost Never." There are three subscales that comprise this measure: (1) Thoughts and Emotions (2) Behaviors-Negative and (3) Behaviors-Positive. The total for each subscale is determined to score the BEST. The scores of subscales A and B are then added together and the total from subscale C is subtracted. A correction factor of 15 is added to yield the final score which can range from 12 (best) to 72 (worst).