Preamble.- Development of Technical Safety.- Interdisciplinary Approach.- Need for a Safety-Methodological Concept.- Generating Safety.- Limits of Safety.- Verifiability of Safety.- Social Considerations.- Interdisciplinary Safety Guideline.- Understanding of the Term Safety.- Introduction to Interdisciplinary Safety Engineering.- Generating Safety.- Safety-compliant Design in Civil Engineering and Process Plant Engineering.- Proposal of the VDI “Technical Safety” Committee.- Summary – lessons learned.