This article 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 both teachers’ ability to analyze instruction and on their instructional practice, as measured by the Mathematical Quality of Instruction instrument and student surveys. However, these improvements in instruction did not result in corresponding increases in math test scores as measured by state standardized tests or interim assessments. We discuss several possible explanations for this pattern of results.

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通过基于Web的教练开发雄心勃勃的数学教学：一项随机试验

本文介绍并评估了一个基于Web的教练程序，旨在支持教师实施与Common Core对齐的数学教学。基于Web的教练程序可以以相对较低的成本运行，具有可扩展性，并使将教师与在内容领域和年级方面具有专业知识的教练配对更加可行。我们的随机现场试验结果表明，无论是教师的教学分析能力还是其教学实践，都受到了“数学教学质量”工具和学生调查的影响，这对教师的影响产生了持续的影响。但是，这些教学上的改进并没有导致相应的数学考试成绩得到相应的提高，而这些成绩是由州标准化考试或中期评估测得的。我们讨论了这种结果模式的几种可能的解释。