International Handbook of Behavior Modification and Therapy

It is particularly gratifying to prepare a second edition of a book, because there is the necessary impli­ cation that the first edition was well received. Moreover, now an opportunity is provided to correct the problems or limitations that existed in the first edition as well as to address recent developments in the field. Thus, we are grateful to our friends, colleagues, and students, as well as to the reviewers who have expressed their approval of the first edition and who have given us valu