For years, NFPA 704, Identification of the Hazards of Materials for Emergency Response, has provided guidance for labeling physical and chemical hazards. The labels, designed to help determine an appropriate response in the event of an emergency, are readily recognized and easily understood. Last year, however, OSHA adopted the Globally Harmonized System of Classification and Labeling of Chemicals (GHS) that, like NFPA 704, provides a standardized approach to classifying and labeling hazardous chemicals. But the GHS guidelines differ from those of NFPA 704. While OSHA allows the NFPA 704 system to remain in workplaces as long as employees understand and can use both systems, concerns have arisen over the possibility for confusion between the two. In his article "Working Together" in the latest issue of NFPA Journal, Guy Colonna describes how NFPA and OSHA are working to avert possible problems.