This case study describes in depth the actions and processes associated with implementing the Classroom Strategies Coaching (CSC) model with a 3rd-grade teacher, Sara. The CSC model uses formative assessment data to support teachers' use of evidenced-based instructional and behavior management practices. The CSC model took place across 8 weeks in a high poverty school. Findings highlight increased use of behavior praise and concept summaries by Sara (single subject effect sizes of 8.49, .56) and reduced need for practice changes in academic performance feedback and behavior praise (as measured by Classroom Strategies Assessment System discrepancy scores [i.e., ∑ recommended frequency-observed frequency]; effect sizes of -1.21, -1.77). Improvements in student academic engagement (effect size of 2.55) and teacher reported instructional support were also found. (PsycINFO Database Record (c) 2019 APA, all rights reserved).