Known for distinguished work in the fields of metaphysics and philosophy of religion, Alvin Plantinga ventures further into epistemology in this book and its companion volume, Warrant and Proper Function. Plantinga examines the nature of epistemic warrant; whatever it is that when added to true belief yields knowledge. This present volume surveys current contributions to the debate and paves the way for his own positive proposal in Warrant and Proper Function. This first volume serves as a good introduction to the central issues in contemporary epistemology.