A Layered Model for Structuring Automotive Safety Arguments

We present a model for structuring automotive safety arguments comprising four different, yet interrelated, layers of safety claims. The layered model is structured by the rationale behind safety requirements, their relationship to corresponding physical artefact(s) and hazardous events, the means used in their development and the environment in which safety activities are undertaken. The layered approach allows for focus and clarity in communicating and assessing the functional safety of automotive Electrical/Electronic systems, particularly in the context of the automotive standard ISO 26262. Keywords—safety cases, safety arguments, ISO 26262, automotive safety.