safety case

A safety case is a structured, evidence-based argument demonstrating that a system is acceptably safe for its intended use. Originating in high-hazard industries, it is now a core requirement in automotive standards like ISO 26262 (Functional Safety) and UL 4600 (Autonomous Systems). Unlike a simple safety report, a safety case emphasizes the logical structure of the argument, often visualized using Goal Structuring Notation (GSN). This approach explicitly links high-level safety goals to strategies and supporting evidence (e.g., test results, simulations, design specifications), making the safety justification transparent, traceable, and auditable for regulators and stakeholders.

Practical application involves three key steps. First, Goal Setting: Define top-level safety goals based on hazard analysis (e.g., HARA in ISO 26262) and decompose them into verifiable sub-goals. Second, Argument Structuring: Use a formal notation like GSN to build a clear, logical argument connecting the goals to the evidence. Third, Evidence Management: Systematically collect, organize, and link all supporting evidence, such as design documents, test reports, and field data. Companies like Waymo and Mobileye use this approach to manage the complexity of AV safety, achieving higher audit pass rates and providing a robust defense against liability claims.

Taiwanese enterprises face several challenges. 1) Talent Gap: A shortage of experts skilled in formal argumentation methods like GSN and standards like UL 4600. 2) Organizational Silos: Difficulty in integrating inputs from R&D, testing, and legal departments, which is essential for a comprehensive safety case. 3) High Initial Cost: The investment in specialized tools and building a pervasive safety culture can be prohibitive. To overcome these, firms should start with a pilot project on a critical subsystem, engage external consultants for initial guidance and training, and establish a cross-functional safety committee to ensure top-down support and resource allocation.

Winners Consulting specializes in safety case for Taiwan enterprises, delivering compliant management systems within 90 days. Free consultation: https://winners.com.tw/contact