Isaac Levi has been extending the epistemological work of the American Pragmatists since the 1960's at least, and this is probably the central exposition of his main views. The book requires a fair amount of background in decision theory and is not for the faint-of-heart. Anyone with an interest in pragmatism or the formalization of knowledge will be richly rewarded if he or she takes the time to digest this book. Some of the polemics vs. "traditional" views of knowledge and decision theory may distract some readers, but if one understands them as a passionate expression of controversial views by a stubborn iconoclast, one comes to realize the extent and independence of this intellectual "enterprise".