This important book digs deeply into the experience of the past few years to improve our understanding of economic development. Professor Chenery, a leading scholar in the field with much practical experience, analyzes differences among countries in types of development, resources, size and the timing of structural changes along with the effects of government policies, foreign trade and finance. He looks for general conclusions about significant similarities and differences. The empirical evidence is used in an initial effort to remedy some of the deficiencies of classical and contemporary theories of development. Methods of analysis and measurement have to be given much attention in a pioneering work of this sort, so the general reader may wish to confine himself to more general passages. But for economists this is an essential book.