Originally published in 1958, this book shows how a systematic consideration of what exactly may be meant by calling anything 'good', inevitably leads on to the more general and fundamental problem of the relations between value-judgments and statements of fact. It does on to explain some of the difficult and far-reaching issues which this problem involves. The book is intended as an introduction for students interested in finding out the nature and point of modern methods of philosophic analysis when applied to problems of moral philosophy.