Using a unique behavioral assessment and treatment planning framework, the updated Sixth Edition provides a systematic overview of behavioral and cognitive principles and their applications to a wide range of issues and situations encountered in human services professions. Up-to-date practice examples drawn from eight diverse case studies illustrate the range and versatility of the behavior change approach in an increasingly diverse and multicultural society, while an innovative chapter on clinical applications of behavioral and cognitive intervention techniques also addresses current influences in the field. This edition embraces the rigorous empirical foundations that have made this approach such a significant contributor to the national and international therapeutic milieu of the 21st century.