Findings form the National Institute on Drug Abuse's Clinical Trials Network protocol documented that one Motivational Interviewing (MI) assessment interview resulted in higher retention rates during the first four MIA:STEP Brochure Coverweeks of treatment when compared to assessments as usual.The MIA:STEP Blending Team designed empirically supported mentoring products to enhance the MI skills of treatment providers, as well as supervisory tools to fortify a supervisor's ability to provide structured, focused, and effective clinical supervision. MIA:STEP introduces an effective strategy for observation-based clinical supervision, the use of which has potential to improve counselor skills beyond MI.