PreTest Self-Assessment and Review, 4th ed., has been designed to provide medical students, as well as physicians, with a comprehensive and convenient instrument for self-assessment and review within the field of epidemiology and public health. The 500 questions provided have been designed to parallel the format and degree of difficulty of the questions contained in Part II of the National Board of Medical Examiners examinations, the Federation Licensing Examination (FLEX), and the Foreign Medical Graduate Examination in the Medical Sciences (FMGEMS).