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Most tests of hypotheses about the effects of “ethnicity” on outcomes use data or measures that confuse or conflate what are termed ethnic structure and ethnic practice. This article presents a conceptualization of ethnicity that makes the distinction between these concepts clear; it demonstrates how confusion between structure and practice hampers the ability to test theories; and it presents two new measures of ethnic practice—ECI (the ethnic concentration index) and EVOTE (the percentage of the vote obtained by ethnic parties)—that illustrate the pay-offs of making this distinction and collecting data accordingly, using examples from the civil war literature.