Ten authors of "seminal works in development economics" were asked by the World Bank to "reassess" and "reconsider" their theories and prescriptions. Some do this more gracefully than others. Some have something new to say. Some familiar ground has to be covered. But the idea has been well carried out and makes as interesting a book as one would expect from Peter Bauer, Colin Clark, Albert Hirschman, Arthur Lewis, Gunnar Mydal, Raul Prebisch, Paul Rosenstein-Rodan, Walt Rostow, H. W. Singer and Jan Tinbergen.