Define a library of safety requirement patterns: select the keywords/concepts from the syntax of requirements patterns to be specialized for safety, specialize selected requirement keywords for automotive context using the vocabulary of ISO26262 (part 1), link requirement concepts with Sophia safety metamodel/profile. Develop an interactive editor for creating [different levels of] safety requirements according to pre-defined library of safety requirement patterns. Develop support to translate the defined safety requirements in formal specification like STL, CTL, LTL formula at lower level of requirements definition, Validate the work by interpreting an Autonomous system safety requirements written in natural language according to the defined safety requirement patterns and show a traceability of safety information.