The manual defines cumulative trauma disorders (CTDs) in the workplace, enables nonmedical personnel to recognize them, and presents strategies for preventing their occurrence. The first part of the manual defined the cumulative trauma category of musculoskeletal disorders. Some common types of CTDs were described along with examples of jobs in which CTDs may occur. Methods were presented for determining how many workers at a particular site have CTDs or some early symptoms of the disorders. Information was provided for conducting an ergonomic job analysis. Two strategies that were used to control or prevent the CTDs from occurring were discussed: instituting personnel focused practices, and redesigning tools, work stations, and jobs. Appendices were included listing specialized material to supplement information such as a glossary of terms and a series of illustrations to define positions and movements of the body, an introduction to the diagnostic process used by the medical profession to identify CTDs and a summary of medical procedures used to treat them, and common epidemiological terms and statistical procedures for evaluating the prevalence, incidence, and severity of CTDs. A series of case histories was provided to illustrate the frequency and costs associated with CTDs among specific work populations.