Risk Likelihood
Risk likelihood is the estimated probability that a specific risk event will occur.
“The probability that a risk will become an actual outcome or event.”
(Definition reproduced from the ISTQB Glossary. Copyright belongs to ISTQB.)
View the complete ISTQB GlossaryWhat is Risk Likelihood?
Likelihood helps determine overall risk level by measuring how probable it is that an identified risk will materialize.
Probability estimate: Expressed qualitatively or quantitatively.
Risk evaluation: Combined with impact during analysis.
Dynamic value: May change as the project evolves.
Real World Example
A regulated product team is preparing a release where Risk likelihood appears in reviews, test design conversations, or defect triage rather than as an isolated glossary word.
The risk is that the team treats Risk likelihood 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 Risk likelihood and similar ideas.
The page becomes useful in practice because Risk likelihood is connected to a specific testing decision, not memorized as a detached definition.
Practice Questions
Question 1
Which statement BEST describes Risk likelihood in the context of ISTQB terminology?
Question 2
A tester needs to explain Risk likelihood to a non‑technical stakeholder. Which approach is MOST appropriate?
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