Is moral knowledge possible? In this book, Torbjorn Tannsjo provides a concise introduction to modern discussions about this question and offers a strong and controversial defense of the theory of moral realism. The author clearly and concisely defines and critically assesses such alternative positions as naturalism, intutitionism, pragmatism, coherentism, and inductivism and fallibilism. Then, he explores both the scope and limits and the moral significance of the theory of moral realism, Building on the work of Lars Bergstrom, David O. Brink, Gilbert Harman, John McDowell, Mark Platts, Warren S. Quinn, Nicholas Sturgeon, Richard Werner, Morton White, and David Wiggins, Tannsjo offers an eloquent explication of moral realism and a superb introduction to the field of moral philosophy.