This study uses a national probability sample of 1,027 mathematics and science teachers to provide the first large-scale empirical comparison of effects of different characteristics of professional development on teachers’ learning. Results, based on ordinary least squares regression, indicate three core features of professional development activities that have significant, positive effects on teachers’ self-reported increases in knowledge and skills and changes in classroom practice: (a) focus on content knowledge; (b) opportunities for active learning; and (c) coherence with other learning activities. It is primarily through these core features that the following structural features significantly affect teacher learning: (a) the form of the activity (e.g., workshop vs. study group); (b) collective participation of teachers from the same school, grade, or subject; and (c) the duration of the activity.

This article examines the effects of professional development on teachers’ instruction. Using a purposefully selected sample of about 207 teachers in 30 schools, in 10 districts in five states, we examine features of teachers’ professional development and its effects on changing teaching practice in mathematics and science from 1996–1999. We found that professional development focused on specific instructional practices increases teachers’ use of those practices in the classroom. Furthermore, we found that specific features, such as active learning opportunities, increase the effect of the professional development on teacher’s instruction.

This article describes tools for measuring the content of instruction, the content of instructional materials, and the alignment between these. Illustrative findings about the use of these tools are reported, and possible additional uses, both for research and practice, are discussed. The validity of data produced through use of these tools is found to be quite good. An agenda for future work is sketched—both for improvement of the quality and versatility of the tools and for use of the tools in research and practice.

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