This is interesting book to understand the liberal institutions.The book is challenging because it provides challenging idea, because book challenges the Neo realist idea that meaningful global cooperation is not possible.So its good to read and clear the concept of liberal institutions,liberalism and Neo realism.Robert Keohane is outstanding professor,its really difficult to write a few words for him or on his book.However he gave a challenge to the present system, and scholars.Learning is not possible without challenge and challenging questions.So the book raising a question.Again I shall say must read to learn.