A revised and expanded second edition of the foundation text of motivational interviewing in counseling explains how to work through ambivalence to facilitate change, presents detailed guidelines for using the MI approach with a variety of clinical populations, and reflects on the process of learning MI. Leading experts then address such topics as MI and the stages-of-change model; using the approach with groups, couples, and adolescents; and applications to general medical care, health promotion, and criminal justice settings.