Tertiary prevention Programs targeting people with clinically apparent disease, with the aim of ameliorating the course of disease, reducing disability, or rehabilitating. Threshold limit Guidelines for rating exposure to hazardous substances that are developed by the American values Conference of Governmental Industrial Hygienists. They are published annually by that organization and generally refer to 8 hours of time-weighted average exposure in a 5-day week. Toxicology The study of adverse effects of chemicals on biologic systems. Walk-through A worksite inspection to identify and assess potential hazards for abatement. Work conditioning A highly structured, goal-oriented, individualized treatment program designed to maximize a or work-hardening person’s ability to return to work. program Workers’ A no-fault, social insurance system for industrial and work injury or illness. In exchange for Compensation prompt compensation of work-related injury or illness, the injured worker, in the majority of states, gives up the right to sue the employer for negligence. The workers’ compensation laws involve an economic and legal principle of liability without fault. 394 Continued on next page
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