This highly effective guide is designed to help attorneys differentiate expert testimony that is scientifically well-established from authoritative pronouncements that are mainly speculative. Building on the foundation of Jay Ziskin's classic work, this updated text blends the best of previous editions with discussion of positive scientific advances in the field to provide practical guidance for experts and lawyers alike. Major contributors in the field summarize the state of the literature in numerous key areas of the behavioral sciences and law. Working from these foundations, the text provides extensive guidance, tips, and strategies for improving the quality of legal evaluations and testimony, appraising the trustworthiness of experts' opinions, and as follows, bolstering or challenging conclusions in a compelling manner. Distinctive features of this text include detailed coverage of admissibility and Daubert challenges, with unique chapters written by an eminently qualified judge and attorney; hundreds of helpful suggestions covering such topics as forensic evaluations, discovery, and the conduct of depositions and cross-examinations; and two chapters on the use of visuals to enhance communication and persuasiveness, including a unique chapter with over 125 model visuals for cases in psychology and law. More than ever, the sixth edition is an invaluable teaching tool and resource, making it a 'must have' for mental health professionals and attorneys.