That socioeconomic planning will increase rather than diminish during the next decades is a fact accepted today even by those business men (according to the Fortune poll), who have traditionally always opposed it. The questions which arise regarding planning are no longer concerned with its advantages and disadvantages but rather with 'How much planning should be undertaken?' 'In what spheres?' 'Who is to do the planning?' and the like. There is now a large literature on the subject (most of which is reviewed in this book) by biologists, economists, sociologists, and political scientists. Doob's book is the first of consequence to be written by a social psychologist who has also a wide knowledge of the cognate fields and therefore is an invaluable addition to the literature. It should be obvious that planning is limited by matters political, economic, and sociologic but it should also be obvious that the success of any plan for change depends on changing men's