Functional Safety
Functional safety is the absence of unreasonable risk caused by hazards resulting from malfunctioning behavior of electrical or electronic systems.
“The absence of unreasonable risk due to hazards caused by malfunctioning behavior of Electric/Electronic(E/E) - Systems.”
(Definition reproduced from the ISTQB Glossary. Copyright belongs to ISTQB.)
View the complete ISTQB GlossaryWhat is Functional Safety?
Functional safety ensures that systems detect faults and respond safely to prevent harm to people, property, or the environment.
Hazard prevention: Safety mechanisms reduce the consequences of failures.
Standards: Often governed by standards such as ISO 26262 or IEC 61508.
Testing focus: Safety functions must be verified under normal and fault conditions.
Real World Example
A regulated product team is preparing a release where Functional safety appears in reviews, test design conversations, or defect triage rather than as an isolated glossary word.
The risk is that the team treats Functional safety as interchangeable with nearby ISTQB terms. That makes test scope blurry and can lead to weak evidence for the release decision.
The tester anchors the discussion in the official definition, asks where the concept appears in the product, and designs examples that show the difference between Functional safety and similar ideas.
The page becomes useful in practice because Functional safety is connected to a specific testing decision, not memorized as a detached definition.
Practice Questions
Question 1
Which statement BEST describes Functional safety in the context of ISTQB terminology?
Question 2
A tester needs to explain Functional safety to a non‑technical stakeholder. Which approach is MOST appropriate?
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