Section 1: Introduction and State of the Art 1. Introduction to Hydrogen Systems in Society - Challenges and Unresolved Issues 2. Framework for Uncertainty Assessments in the Development of Hydrogen Regulations 3. Mapping the State of Hydrogen Research: Integrating Findings and Identifying Gaps, Global Perspectives on the Hydrogen Value Chain Section 2: Case Studies and Experimental Tests 4. Risk Communication and Preparing the Public for the Hydrogen Society 5. Overview on Experimental Campaigns 6. Active Ventilation of Confined and Congested Geometries 7. Effect of Initial Flow and Mitigation Measures on Explosions 8.

Passive Fire Protection for Hydrogen Equipment 9. Material Degradation Issues for Hydrogen Containment 10. Blind Predictions to Reveal Uncertainties and Critical Assumptions in Various Risk and Consequence Assessments of Hydrogen Systems Section 3: Implications of Experimental Results 11. Validation of Relevant Phenomenological Models 12. Risk Based Operational Safety, Modelling, Monitoring and Establishing Safety Barriers Section 4: Conclusions and Relevant Trends 13. Strength of Knowledge in the Safety Design and Assessment of Hydrogen Systems - Theoretical Perspectives and Practical Implications 14. Future Developments.