ISO 21448

ISO 21448

ISO 21448 is an international technical specification addressing Safety of the Intended Functionality for systems where safety is affected by intended functionality rather than hardware failures. It provides guidance for identifying, assessing, and mitigating hazards arising from functional performance limitations, environmental conditions, or foreseeable misuse. The specification complements existing functional safety frameworks and is widely referenced by automotive manufacturers, suppliers, regulators, and research institutions.

Background and scope

ISO 21448 was developed within the International Organization for Standardization technical committee structure to address gaps identified by stakeholders including European Commission, UNECE, Society of Automotive Engineers, and national standards bodies such as DIN, BSI, and AFNOR. The initiative traces conceptual lineage to work by research centers like TU Delft, Fraunhofer Society, and TNO and draws on incident analyses involving companies such as Tesla, Inc., Toyota Motor Corporation, and Volkswagen Group. Its scope covers driver assistance, automated driving, and other electromechanical and software-driven systems where functionality itself can create hazards; contributors included manufacturers, suppliers, regulators, and academic partners like MIT, Stanford University, ETH Zurich, and Imperial College London.

Safety of the intended functionality (SOTIF) standard

The SOTIF standard targets hazardous scenarios that arise without component failures, including perception limitations, algorithmic misinterpretation, and human–machine interaction issues. It formalizes processes similar to those used in work by NHTSA, IIHS, and research from Honda Research Institute, with methodological overlap to initiatives at DARPA and findings from European New Car Assessment Programme. SOTIF complements lessons from historical events cataloged by institutions such as NASA and National Transportation Safety Board while being informed by technological trends championed by firms like Waymo, NVIDIA, and Mobileye.

Key requirements and processes

ISO 21448 prescribes activities for hazard identification, scenario cataloguing, risk assessment, validation, and mitigation planning. It mandates iterative analysis—drawing on techniques used at Carnegie Mellon University, University of Michigan, and KAIST—including scenario-based testing, simulation, field testing, and boundary definition. The standard encourages use of diverse data sources such as datasets produced by KITTI, Cityscapes Dataset, and initiatives by OpenAI-affiliated labs, and promotes integration with verification methods from IEEE, ISO/IEC JTC 1, and practices from SAE International. It specifies documentation practices, acceptance criteria, and monitoring mechanisms analogous to compliance approaches used by FAA, EMA, and European Medicines Agency in their respective domains.

Relationship to other standards and regulations

ISO 21448 is intended to be used alongside functional safety standard ISO 26262, cybersecurity frameworks such as ISO/SAE 21434, and system engineering standards like ISO 15288 and IEC 61508. Regulators including UNECE WP.29, European Commission Directorate-General for Mobility and Transport, and national ministries reference its approaches when formulating guidance for Automotive Industry vehicles, connected systems, and automated transport corridors. It interacts with type-approval regimes in jurisdictions overseen by authorities like DVSA, KBA, and NHTSA and complements voluntary test protocols developed by organizations such as Euro NCAP, JNCAP, and ANCAP.

Implementation and industry adoption

Industry adoption has grown among OEMs, Tier‑1 suppliers, and technology companies including Bosch, Continental AG, Denso Corporation, and Aptiv PLC. Adoption strategies involve cross-disciplinary teams from R&D groups at Ford Motor Company, General Motors, Hyundai Motor Company, and software divisions at Google, Microsoft, and Amazon for cloud and AI toolchains. Certification and auditing bodies like TÜV Rheinland, SGS, and Bureau Veritas offer assessment services aligned with the specification. Academic and consortia efforts such as PEGASUS Project, European Commission Horizon 2020, and collaborations between Clemson University and industrial partners support toolchains, scenario libraries, and validation campaigns to operationalize the standard across simulation platforms from Ansys, dSPACE, and Siemens PLM Software.

Category:Standards