Truth commissions are increasingly common after conflict and authoritarian rule, yet we know little about the different ways they are being used. Despite recent efforts to bridge conceptual gaps and resolve disagreement over the universe of cases, TCs are notoriously undertheorised and proponents have yet to answer why their record is so inconsistent. Through developing a typological approach to TCs, the article lays the groundwork for exploring the forms they need to take to have an impact. It argues for a (...) more nuanced understanding of the term that captures both the breadth of current practice and recasts conceptual debates on the spectrum of design options that are available to policymakers but are often overlooked. The findings are important as they offer a first set of impressions on emerging spatial and temporal patterns and trends that are developing due to the purported transnational diffusion and social learning of ideas about TCs. (shrink)