This chapter explores some of the ways in which indicators interact with law. Accordingly, it studies the Rule of Law Index, an indicator developed and applied by the World Justice Project to measure the adherence of almost 200 countries to the rule of law. Such quantitative technologies of measurement, this chapter argues, are here to stay in the law and development agenda. They create a community of practice and provide normative criteria for the evaluation of whether a country adheres to their particular idea of what the rule of law is (and is not). Because of their origin in multilateral financial institutions, the Index and other rule of law indicators tend to be seen by some as implausible neoliberal simplifications that simply should be dismissed. This chapter takes a different perspective. Irrespective of the Index's origins, the genie is out of the bottle. Rule of law indicators are veritable technologies of global governance, and it is therefore important to engage with them, as they open a space for contestation, intervention, and policy debate on what it means to encourage the rule of law in the developing world.