Book excerpt: Not since Anna Freud's 1937 book, The Ego and the Mechanisms of Defense, has any one volume explored this topic as fully as Ego Mechanisms of Defense by George E. Vaillant. By summarizing the latest empirical studies, proposing a universal language of defense mechanisms, and demonstrating how various assessment methods can be used in diagnosis, case formulation, and treatment, Dr. Vaillant and an interdisciplinary group of contributors provide the groundwork for clinical practice as well as future research in the field.