A world of evidence: the global spread and silent politics of evidence cultures

How can we explain the worldwide spread of evidence-based policymaking despite continuous criticism? What are the underlying mechanisms of its persistence on a global scale? This article aims at answering these questions by focusing on the cultural constellations in which evidence is imbued with political as well as epistemic authority. Evidence cultures are discursive and institutional forces (re-)producing both the scientific validation of knowledge and its relevance in policymaking. They need to be understood as self-propagating constellations of interlinking science and policy through practices, discourses and institutionally sedimented regulations. Evidence is the product of chains of practices in which the initial knowledge struggles are gradually made publicly invisible and often inaccessible. The article reconstructs the immunization of evidence cultures from criticism and their silent politics by looking at quantifications, benchmarking and randomized controlled trials as typical cases. To overcome the circularities and closures so characteristic of the evidence culture of evidence-based policymaking, politico-epistemic diversity should be actively promoted.