Two new publications from the European Agency for Safety and Health at Work (EU-OSHA) provide information about legislation for and substitution of dangerous substances. The first publication discusses the European Union’s OSH Framework Directive, Chemical Agents Directive, and Carcinogens and Mutagens Directive. Topics covered include risk prevention, risk assessment, and the “STOP principle,” a hierarchy of prevention measures prescribed by European law. The STOP principle lists prevention measures in the following priority order: substitution, technological measures, organizational measures, and personal protective measures. The other publication explains the process of substituting dangerous substances in the workplace. The steps in the substitution process include identifying hazards and risks, looking for restrictions on substances, preparing a comprehensive risk assessment, finding alternatives, and introducing a chemical management system. The publication also describes best practices and risk assessment tools and methods. The publications are available on EU-OSHA’s .