The purpose of this article is to describe the practice-based coaching model used in BEST in CLASS, a Tier-2 classroom-based intervention comprised of evidence-based instructional practices designed to prevent and ameliorate the chronic problem behaviors of young children at risk for the development of emotional/behavioral disorders. Following a description of the model, data from year two of an ongoing 4-year randomized control trial are presented that describe (a) the amount (i.e., dosage) of coaching teachers received during BEST in CLASS implementation, (b) the integrity with which coaches implemented the BEST in CLASS coaching model, and (c) subsequent teacher implementation of the BEST in CLASS strategies. Forty-eight (23 BEST in CLASS; 25 comparison) teachers and ten coaches participated in this descriptive study. Data indicate that following coaches' observations, teachers received approximately 30 min of practice-based coaching during coaching meetings each week of implementation, and integrity data indicate that coaches implemented the critical coaching skills during the coaching meetings with integrity. Adherence data indicate that teachers in the treatment group increased their extensiveness of the use of BEST in CLASS practices at both post-treatment and 1-month follow-up compared to comparison teachers; competence data indicated that teachers in the treatment group increased the quality of delivery of practices at post-treatment compared to comparison teachers. Implications of these findings for both future research and practice-based coaching implementation are discussed.