ISO 21448: Acceptance Criteria Frameworks — GAMAB, MEM, and Positive Risk Balance Compared

Date
2027-03-05
Location
Online
Host
Zach L
Register

About this event

A live 30-minute expert session on Acceptance Criteria Frameworks — GAMAB, MEM, and Positive Risk Balance Compared (ISO 21448 — Safety of the Intended Functionality). What We'll Cover: What acceptance criteria are in ISO 21448 and why the standard leaves the framework choice — GAMAB, MEM, ALARP, positive risk balance — to the developer The selection method step by step: regulatory context, baseline data availability, framework math worked on the same example function How the chosen criterion maps to ISO 21448 Clause 6 and anchors the validation-target and residual-risk artifacts Common mistakes: mixing frameworks mid-program, using human-driver averages without exposure correction, criteria that cannot be measured before launch The evidence assessors look for: documented rationale for the framework, its quantitative form, and consistency across all downstream targets Related topics: acceptance criteria · positive risk balance · gamab · mem minimum endogenous mortality · alarp · risk acceptance framework · societal risk · human driver baseline · risk quantification · regulatory alignment · avsc guidance · ethical risk · criterion selection · validation anchor 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

Topics

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

Risk reduction allocation
Distributing required risk reduction among mechanical design, safeguards, control functions and procedures.
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.
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.