Pairwise Testing
Pairwise testing is a combinatorial test design technique that creates test cases so every possible pair of input parameter values is tested at least once.
“A black-box test technique in which test cases are designed to exercise pairs of parameter-value pairs.”
(Definition reproduced from the ISTQB Glossary. Copyright belongs to ISTQB.)
View the complete ISTQB GlossaryWhat is Pairwise Testing?
Pairwise testing significantly reduces the number of required test cases while detecting many interaction defects caused by two-way parameter combinations.
Two-way combinations: Every pair of values is covered.
Efficiency: Far fewer tests than exhaustive testing.
Combinatorial technique: Often generated using specialized tools.
Real World Example
A regulated product team is preparing a release where Pairwise testing appears in reviews, test design conversations, or defect triage rather than as an isolated glossary word.
The risk is that the team treats Pairwise testing 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 Pairwise testing and similar ideas.
The page becomes useful in practice because Pairwise testing is connected to a specific testing decision, not memorized as a detached definition.
Practice Questions
Question 1
Which statement BEST describes Pairwise testing in the context of ISTQB terminology?
Question 2
A tester needs to explain Pairwise testing to a non‑technical stakeholder. Which approach is MOST appropriate?
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