This lecture covers risk reduction strategies and principles, including types of decisions in risk management, models of unwanted events, managing risks, prevention principles, protection measures, anticipation versus reaction, and the precautionary principle. It also discusses chemical and bio-hazards in Switzerland, risk treatment according to ISO 27001, risk control methods, layers of protection analysis, and the 5S methodology for risk reduction. The lecture concludes with crisis management concepts, including crisis modeling, chronology, and real-life examples like the Deepwater Horizon incident and the COVID-19 crisis.