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This article aims to reexamine the issue of “evidence-based government” in the light of the current profusion of evaluative technologies that aim to produce such hard “evidence” (data, benchmarks, statistics, etc.). Beyond mapping the types of knowledge and techniques that make up the evaluation devices dedicated to informing governmental activities, our purpose here is to discern the process of rationalization and formalization, and of legitimation and delegitimization, by which certain data end up being considered as “hard facts” that an effective management simply cannot ignore. Such an interrogation of facts and their use in the exercise of power implicitly raises the problem of possibilities and their objectivation as resources of resistance.