This student guide is intended to assist persons employed as supervisors in understanding and practicing principles of occupational health and safety. Discussed in the first three sections are the following topics: health and safety at work (causes of accidents, ways of dealing with and reporting accidents, procedures for preventing accidents and inspecting workplaces, work rules on health and safety, strategies for training and encouraging safety consciousness, and ill health brought about through work); Great Britain's Health and Safety at Work Act (employer responsibility for health and safety, personnel with special health and safety interests, information that employers must provide, and employee responsibilities for health and safety); and enforcement of the law and the powers of the Health and Safety Inspectorate. Each of these sections contains an introduction, sections of instructional text that are interspersed with reinforcing learning activities, and a section summary. The fourth part of the guide includes a series of performance checks (an end check, a tutor check, and a work-based project). Concluding the guide is a unit review that reviews the objectives addressed in the guide, describes related extension courses, and lists recommended reference materials. (MN)