There are four main types of workplace hazards: physical, ergonomic, chemical, and biological. To correct workplace hazards, there are three major areas of change: hazard classification, labels, and safety data sheets. Hazard classification criteria have been updated to ensure consistent evaluation of health and physical hazards. Labels must now include a signal word, pictogram, and hazard statement for each hazard class. Safety data sheets have a specified 16-section format. Employers must also provide worker education and training programs and keep records of them.