This text presents epidemiologic methods for studying injuries and evaluating interventions to prevent them. It explains how to formulate research questions, the sources of reliable and valid data, and the best choice of research methods. The difficulties of applying rates and ratios to the evaluation of programs are discussed, and the use of economic concepts and policy analysis is covered. It provides specific objectives for research in the various stages of injury control planning and implementation, including the types of data needed to reach the objectives. This third edition is fully updated throughout with new studies used as discussion examples. The chapters have been reorganised into more precise topic areas, for ease of reference.