This paper describes and evaluates a web-based coaching program designed to support teachers in implementing Common Core-aligned math instruction. Web-based coaching programs can be operated at relatively lower costs, are scalable, and make it more feasible to pair teachers with coaches who have expertise in their content area and grade level. Results from our randomized field trial document sizable and sustained effects on teachers’ ability to analyze instruction and on their instructional practice, with the latter measured by scores on the Mathematical Quality of Instruction (MQI) rubric and student surveys. These impacts did not result in increases in student achievement as measured by state standardized tests or supplemental formative assessments in math, although we cannot rule out the possibility of small effects.
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