This article provides the necessary tools to advance comparative research studying the substantive representation of ethnic minorities and women. Firstly, I clarify how the various indicators for individual representatives’ and parliaments’ considerateness of the interests of traditionally excluded groups used in earlier (mostly single-country) studies relate to each other and discuss the advantages and drawbacks of different measures for quantitative comparative research. Secondly, the present article introduces new data comprising three indicators for the substantive representation of ethnic minorities.