Safety of the Intended Functionality (SOTIF)

SOTIF (Safety of the Intended Functionality) is a critical concept that complements Functional Safety (ISO 26262). While ISO 26262 addresses hazards arising from system malfunctions, SOTIF focuses on risks present even in the absence of a fault. These risks stem from functional insufficiencies, performance limitations of sensors and algorithms, or reasonably foreseeable human misuse. For instance, an autonomous emergency braking (AEB) system failing to detect a pedestrian in heavy rain due to camera limitations is a SOTIF issue. The governing standard is ISO 21448:2022. In enterprise risk management, SOTIF, alongside functional safety (ISO 26262) and cybersecurity (ISO/SAE 21434), forms the three pillars of automotive safety, ensuring comprehensive risk mitigation for ADAS and autonomous vehicles.

The practical application of SOTIF in enterprise risk management follows the ISO 21448 framework, which involves three key steps: 1. **Scenario Identification & Hazard Analysis**: Systematically identify all operational scenarios that could trigger unsafe behavior. This involves analyzing known safe scenarios, known unsafe scenarios, and attempting to uncover unknown unsafe scenarios through exploratory testing. 2. **Risk Assessment & Functional Modification**: For each identified hazardous scenario, assess the level of risk. If the risk is unacceptable, the system's functionality must be modified. This could involve enhancing sensor capabilities, refining algorithms, or implementing driver alerts to handle triggering conditions safely. 3. **Verification & Validation**: Conduct extensive testing—using simulation, closed-course proving grounds, and real-world driving—to confirm that the modifications have reduced the risk to an acceptable level. A leading Tier-1 supplier increased its scenario validation coverage by 40% and successfully passed OEM SOTIF audits by implementing this process.

Taiwanese enterprises face three primary challenges when implementing SOTIF: 1. **Lack of Localized Scenario Databases**: Taiwan's unique traffic environment, with a high density of scooters and complex urban intersections, is not adequately covered by generic international scenario databases, challenging the completeness of validation efforts. 2. **Cross-Disciplinary Talent Integration**: SOTIF requires a seamless fusion of expertise in systems engineering, AI, human factors, and safety analysis. Organizational silos often hinder the formation of effective cross-functional teams needed to address these complex issues. 3. **Complex Development Process Integration**: Integrating SOTIF activities into existing V-Model or Agile development lifecycles is a significant challenge, often requiring new toolchains and disrupting established project workflows. **Solution**: A prioritized action is to collaborate with local research institutions like ARTC to access test environments and data, while investing in simulation platforms to cost-effectively expand test coverage. Engaging external experts like Winners Consulting can accelerate knowledge transfer and methodology implementation.

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