Safety Data Sheets (SDSs), formerly known as Material safety Data Sheets (MSDSs), produced by manufacturers of hazardous chemicals and/or substances, are the basis of communicating hazards. SDSs must be up to date and easily accessible to all employees. Furthermore, conspicuous labeling of all chemicals — including solutions and mixtures — is required. An additional component of the Hazard Communication Program is the receipt of proper training for all individuals working with or around hazardous substances. This includes the ability to easily recognize and identify hazard labels, as well as receipt of refresher training when necessary.