This chapter reviews some of the technical challenges of context in designing and interpreting corruption measurement. It focuses on the methods that have been developed and used and how they have begun to provide policy makers with more targeted and useful knowledge about corruption. The chapter examines some of the approaches that have been used to capture corruption and how they contribute to understand corruption levels. It reviews some of the characteristics of corruption measurements that make considerable demands on both the researcher and the user of such tools. Quantitative data provides a basis for the employment of, perhaps, the most beloved tools of the social scientist, econometrics. The chapter discusses the selection and identification of what to measure in order to capture policy relevant characteristics as are the ways in which links between actors are established in the identification of networks. Corrupt transactions occur in networks that are highly organised as well as opportunistically.