Historical explanations seek to identify the causes of outcomes in particular cases. Although social scientists commonly develop historical explanations, they lack criteria for distinguishing different types of causes and for evaluating the relative importance of alternative causes of the same outcome. This article first provides an inventory of the five types of causes that are normally used in historical explanations: (1) necessary but not sufficient, (2) sufficient but not necessary, (3) necessary and sufficient, (4) INUS, and (5) SUIN causes. It then introduces a new method—sequence elaboration—for evaluating the relative importance of causes. Sequence elaboration assesses the importance of causes through consideration of their position within a sequence and through consideration of the types of causes that make up the sequence as a whole. Throughout the article, methodological points are illustrated with substantive examples from the field of international and comparative studies.

In recent years, a variety of efforts have been made in political science to enable, encourage, or require scholars to be more open and explicit about the bases of their empirical claims and, in turn, make those claims more readily evaluable by others. While qualitative scholars have long taken an interest in making their research open, reflexive, and systematic, the recent push for overarching transparency norms and requirements has provoked serious concern within qualitative research communities and raised fundamental questions about the meaning, value, costs, and intellectual relevance of transparency for qualitative inquiry. In this Perspectives Reflection, we crystallize the central findings of a three-year deliberative process—the Qualitative Transparency Deliberations (QTD)—involving hundreds of political scientists in a broad discussion of these issues. Following an overview of the process and the key insights that emerged, we present summaries of the QTD Working Groups’ final reports. Drawing on a series of public, online conversations that unfolded at www.qualtd.net, the reports unpack transparency’s promise, practicalities, risks, and limitations in relation to different qualitative methodologies, forms of evidence, and research contexts. Taken as a whole, these reports—the full versions of which can be found in the Supplementary Materials—offer practical guidance to scholars designing and implementing qualitative research, and to editors, reviewers, and funders seeking to develop criteria of evaluation that are appropriate—as understood by relevant research communities—to the forms of inquiry being assessed. We dedicate this Reflection to the memory of our coauthor and QTD working group leader Kendra Koivu.1

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