When you believe something for a good reason, your belief is in a position to be justified, rational, responsible, or to count as knowledge. But what is the nature of this thing that can make such a difference? Traditionally, epistemologists thought of epistemic normative notions, such as reasons, in terms of the believer's psychological perspective. Recently, however, many have started thinking of them as factive: good reasons for belief are either facts, veridical experiences, or known propositions. This ground breaking volume reflects major recent developments in thinking about this 'factive turn', and advances the lively debate around it in relation to core epistemological themes including perception, evidence, justification, knowledge, scepticism, rationality, and action. With clear and comprehensive chapters written by leading figures in the field, this book will be essential for students and scholars looking to engage with the state of the art in epistemology.