In this important book, one of the most exciting and promising developments in clinical psychology-behavior modifi cation is applied to the treatment of the mentally retarded, particularly those whose behavior poses diffi cult problems for institutions. William I. Gardner presents an easily intelligible yet detailed account of the concepts and practices of behavior modifi cation and the underlying learning systems, with numerous clinical illustrations of applying specifi c techniques to various educational and rehabilitation problems. A thorough discussion of the inadequacies of the...