The thoroughly updated Third Edition of this popular and widely used review book offers excellent preparation for the CK (clinical knowledge) component of the USMLE Step 2. This edition contains twenty simulated USMLE tests, totaling 1,000 clinical vignette-based questions followed by answers and explanations. All vignettes, questions, incorrect answers (distracters), correct answers, and explanations conform to current clinical practice and current USMLE style. Explanations for both correct and incorrect answers are included to help the student understand why (s)he chose an incorrect distracter. A bound-in CD-ROM contains all the question-and-answer material, and enables students to customize quizzes.