Has the scale of corruption been increasing over the years? Are some countries more corrupt than others? In order to answer these questions, we need to be able to measure corruption, which is a particularly difficult task because we cannot agree on what constitutes corruption and there is difficulty in obtaining information. ‘Can we measure corruption?’ describes four common methods used to measure the scale of corruption—official statistics, perceptual and attitudinal surveys, experiential surveys, and tracking surveys—along with some less common ones. All methods have something to offer, but none is without problems. In most research projects, deploying a ‘mixed methods’ approach is better.