This edited, multi-authored text brings together all that is known about Systems Training for Emotional Predictability and Problem Solving (STEPPS), a group treatment program for outpatients with borderline personality disorder. The book describes the program, the evidence that is supportive of STEPPS, and its implementation in a variety of settings and countries. Created at the University of Iowa in 1995, STEPPS combines cognitive-behavioral therapy, skills training, and psychoeducation with a systems component for family, friends, and significant others. The 5-month-long program is easily learned and delivered by therapists from a wide range of theoretical orientations. Data show that STEPPS is effective and produces clinically important improvement. The program is well accepted by patients and therapists. STEPPS is listed in the US Substance Abuse and Mental Health Services Administration (SAMSHA) National Registry of Evidence-based Practices (NREPP). The program is embraced by the health care systems in the United Kingdom and The Netherlands and is used in correctional settings.