ISO 21448: The SOTIF Release Argument — Assembling Clause 12 Evidence into a Defensible Case

Date
2027-06-01
Location
Online
Host
Zach L
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About this event

A live 30-minute expert session on The SOTIF Release Argument — Assembling Clause 12 Evidence into a Defensible Case (ISO 21448 — Safety of the Intended Functionality). What We'll Cover: What the SOTIF release decision is under ISO 21448 Clause 12 and how it differs from the ISO 26262 release for production The assembly method step by step: claims structure, evidence mapping per clause, open-point disposition, and sign-off roles How the argument maps to ISO 21448 work products and produces the SOTIF release report and argument (GSN) artifact Common mistakes: evidence lists without an argument, unresolved Area 3 estimates buried in appendices, release granted with unbounded field-monitoring promises The traceability assessors check: every acceptance criterion closed by named evidence, and every residual risk explicitly accepted by an accountable role Related topics: sotif release · clause 12 · safety argument · gsn goal structuring notation · release for production · residual risk acceptance · evidence mapping · safety case · open points disposition · release criteria · sotif report · assessment readiness · argument structure · sign off authority Critical Systems Analysis provides embedded functional safety consulting for ISO 21448 — Safety of the Intended Functionality. Learn more: https://criticalsystemsanalysis.com Partner with us: https://meetings.hubspot.com/benjamin-twombly/strategic-partnerships

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About Functional Safety Foundations

This online session delivers expert-led instruction on the regulatory landscape and implementation approach for Functional Safety Foundations.

The cross-sector fundamentals underlying every functional safety standard: risk as severity × likelihood, the safety function concept, integrity levels, the safety lifecycle, and the split between random and systematic failures.

What it regulates

Shared vocabulary and reasoning: hazard → risk → risk reduction allocation → safety requirement → verified implementation → maintained integrity in operation.

Who must comply

Everyone entering the field — the conceptual base of the entire catalog.

Key requirements of Functional Safety Foundations

  • Hazard and risk fundamentals
  • Safety function anatomy: sensor-logic-actuator with defined safe state
  • Integrity ladders (SIL/PL/ASIL/DAL) as risk-reduction currencies
  • Random vs systematic failure treatment
  • Lifecycle and management of functional safety incl. competence

Key concepts: Functional Safety Foundations

Functional safety management
Planning, competence, documentation and assessment wrapped around technical work.
Random vs systematic
Hardware wear-out/chance failures quantified statistically versus design/process errors controlled by rigor.
Risk reduction allocation
Distributing required risk reduction among mechanical design, safeguards, control functions and procedures.
Safe state
The defined condition a function drives the equipment to on demand or fault.

Frequently asked questions: Functional Safety Foundations

Why can't testing alone prove safety?

Rare-event targets (like 1e-7/h) are unverifiable by test duration, and systematic errors evade random testing — hence the standards' dual machinery of quantified hardware analysis plus process rigor and independent assessment.

Standard information based on the published text of Functional Safety Foundations. Event content is provided by the host. For authoritative guidance, consult the official standard body.