This concise book is useful in conjunction with the free practice CD-ROM supplied by the NBME for quick review for the new CBT version of the USMLE Step 1 examination. The Stanford Solutions team have answered the questions on the practice CD-ROM and then written clear explanations (with references) to each of the answers. The book: covers the most up-to-date sample questions for the new Computer-Based-Test; Explains not only the correct answers but why the wrong answers are actually wrong; Provides critical background information and useful related facts; Includes relevant mnemonics to help memorise important facts; Even covers a few errors in sample answers.