Since 1975, when the University of Oklahoma faculty created their review course for second-year medical students, the Oklahoma Notes have been among the most trusted and widely used reviews for the National Boards. Each Oklahoma Notes book presents the core information of one segment of the medical school curriculum. Written by some of the most effective medical educators in the country, the Oklahoma Notes feature: Concise text presented in outline format for rapid review; contents oriented to promote Boards success; self-assessment questions geared to the current format of the NBME exam; more tables and figures designed to facilitate self-assessment and review; and low-cost, complete coverage of each subject. In 1993, Springer-Verlag launched the first five Oklahoma Notes to cover the clinical sciences: General Surgery, Internal Medicine, Neurology and Clinical Neuroscience, Pediatrics, and Psychology. Obstetrics and Gynecology continues the expansion into the clinical sciences.