Sherrilyn Roush defends a new theory of knowledge and evidence, based on the idea of ''tracking'' the truth, as the best approach to a wide range of questions about knowledge-related phenomena. The theory explains, for example, why scepticism is frustrating, why knowledge is power, and why better evidence makes you more likely to have knowledge. Tracking Truth provides a unification of the concepts of knowledge and evidence, and argues against traditional epistemological realist and anti-realist positions about scientific theories and for a piecemeal approach based on a criterion of evidence, a position Roush calls ''real anti-realism.'' Epistemologists and philosophers of science will recognize this as a significant original contribution.