Contextualism has become one of the leading paradigms in contemporary epistemology. According to this view, there is no context-independent standard of knowledge, and as a result, all knowledge ascriptions are context-sensitive. This comprehensive anthology collects twenty original essays and critical commentaries on different aspects of contextualism, written by leading philosophers on the topic. The editors' introduction sketches the historical development of the contextualist movement and provides a survey and analysis of its arguments and major positions.