School choice is becoming an increasingly common policy in school dist
ricts, although it remains controversial and its outcomes are not well
understood. This article argues that we need better definitions and m
easures of the practices and policies that create school choice and th
at this can contribute to a clearer understanding of the nature of sch
ool choice and To more effective planning and evaluation This article
proposes system (district)-level indicators of school choice that oper
ationalize the concept of ''school choice.'' The types of indicators p
resented here could produce valuable interdistrict comparative informa
tion on processes and outcomes of school choice.