Injury control, a new branch of engineering science, is developing rapidly, incorporating the fundamentals of biomechanics, engineering mechanics, and control design. This book covers optimal protection from impact, especially the prevention of injuries. The book's first part presents the fundamentals of impact, without specific reference to injury control. Building on the first part, the second part deals with particular injuries. Treating the human body as a multi-faceted engineering system, the coverage illustrates system designs to prevent injury under specific environmental conditions, whether in an automobile, aircraft, or military situation.