Three substantial new chapters and a new preface in this third edition explore and elaborate the relationship between the evaluation of programs and the study of their implementation. The authors suggest that tendencies to assimilate the two should be resisted. Evaluation should retain its enlightenment function while the study of implementation should strengthen its focus on learning.
Of universal application . . . this is an analysis of why the urban crisis has proved so intractable . . . . Nobody who reads this book will ever again be surprised by the gulf between promise and performance in a program to help revive or save or rebuild the country's cities.