"The best book we have on this subject," according to Jerome Frank, is Irvin D. Yalom's "Theory and Practice of Group Psychotherapy," which has been used internationally for decades as the main reference book for group psychotherapy. The American Journal of Psychiatry characterized it as one of the ten psychiatric publications that had the greatest influence in the 1970s, when it was first published.
For this fully revised and expanded fifth edition, which was released in the US in the summer of 2005, Professor Irvin Yalom collaborated with his student, Professor Molyn Lesz, to present the most contemporary guidelines for research and application of group psychotherapy, exploring the latest developments and drawing on their material from new research of the past decade and from their extensive personal clinical experience and knowledge. This revised edition includes new sections on brief group therapy, internet-based therapeutic groups, cultural specificities, trauma, managed care, and specialized and structured groups (e.g. groups for addictions and for patients with physical illnesses).
Irvin Yalom and Molyn Lesz have fully updated the style and content of the chapters, added new clinical examples, while retaining the clinical and research information that remains valid. The text is enriched by vivid examples from the thousands of group sessions they have coordinated over the decades they have been practicing group psychotherapy.
"Theory and Practice of Group Psychotherapy" is a handbook that combines rich scientific information with vivid description. This edition is the most up-to-date, comprehensive, and in-depth study of group psychotherapy available today.

The essential book for group psychotherapy. It covers all the major trends and useful methods that anyone who coordinates groups of any kind should know before taking on the role. Yalom, with the collaboration of Lesz, assimilates and combines here the latest scientific research with classic studies, in an enjoyable and enlightening reading experience. It extensively discusses the core mechanisms necessary for therapeutic change to occur within a group. Additionally, it presents ways in which one can deal with difficult group members and strategies for achieving the basic therapeutic goals. Its engaging language makes his deep clinical experience even more captivating.
Samuel T. Gladding, President of the American Counseling Association (2004-2005)