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The functional safety concept definition is the backbone of a project's safety process; poor choices made at this stage can have significant impact. A weak concept may result in over-engineering of systems; late re-work when missing safety requirements are eventually uncovered at advanced stages of the development process; disagreements within the supply chains regarding responsibility for safety mechanisms; or, of most concern, release of an unsafe product. Despite this importance, ISO 26262 states that the functional safety requirements are to be derived from the safety goals (top-level safety requirements) and only notes that safety analysis might be used to support this task, giving no further guidance on how this might be done. The automotive industry's typical time pressures mean that being able rapidly to produce an initial safety concept is critical if it is to influence the system architecture and procurement decisions.