This testimony concerns the position of NIOSH on OSHA's proposed rule on hazard communication. NIOSH suggests major revisions be made in several areas to adequately address the full range of worker hazard communication needs. NIOSH believes the scope of the Rule is too narrow and should include many other industry classes in which there is potential for exposure to hazardous materials including the construction industry and the service industry (specifically workers involved in automotive repair, hospitals and vocational schools). Under the present proposal, contract workers for construction and maintenance would not be covered. Additional suggestions are made concerning the adequacy of allowing evaluation of hazards by employers, the adequacy of definitions in the rule, the exemption of importers, record keeping requirements, maintenance of a written plan of hazard communication, the design of labels and placards, and worker training.