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The California Study of Elementary Mathematics

The purpose of the California Study of Elementary Mathematics is to examine the effects of state education reform in elementary mathematics curriculum on teaching and learning in elementary mathematics classrooms. In this article, we describe the methodology used in the study. We begin by providing an overview of the state policy that is aimed at realizing anew vision of mathematics teaching and learning. Then we describe participants and data collection procedures at each of four levels—state, school district, school, and classroom (teachers and students). We conclude with a description of methods used to collect the classroom-level data from which we constructed the cases in this issue.