Attempts at preventing antisocial behavior among children have ranged from infant schools to residential treatment centers, from social training to psychological therapies. Evaluations of the programs have typically been little more than testimonials to current fashions. The unique contribution of the 20th Century, according to the authors, has been method. By introducing experimental approaches to the study of intervention strategies, enduring results can issue even from programs that have failed to achieve their therapeutic goals. The authors intended to provide readers the opportunity to consider evaluation techniques while enabling some readers to develop strategies for evaluating their own programs. In addition, they hoped to stimulate clearer consideration of evaluation strategies and to show some of the imaginative interventions designed to assist children at every age. References, tables, figures, list of contributors