Professor Dan Hough (University of Sussex), Professor Elizabeth Dávid-Barrett (University of Sussex/ International Anti-Corruption Academy) and Dr. Roxana Bratu (King's College London) provide an introduction to corruption measurement debates. They explore questions like: How has measurement of corruption changed over the three decades? What are the best tools currently available for measuring corruption? What are the strengths and weaknesses of these tools? What are 'proxy indicators' for measuring corruption? What do users actually want from corruption measurement tools?