Chapter 4 – Test Analysis & Design
Combinatorial Testing – ISTQB Definition
Last Updated: July 12, 2026 · SoftwareTestPilot QA Team
Official ISTQB Definition
A means to identify a suitable subset of test combinations to achieve a predetermined level of coverage when testing an object with multiple parameters and where those parameters themselves each have several values.
In simple words
A family of techniques (pairwise, orthogonal arrays, classification tree) that shrink an exploding combination space to a manageable subset.
Exam tip
Combinatorial techniques are the answer when 'test everything' would take millions of test cases.
Related terms
- Pairwise TestingInstead of testing every combination, test every pair of inputs at least once — catches most combination bugs with far fewer tests.
- Orthogonal Array TestingA math-based way of picking a small, balanced set of test cases that still covers every pair of input values.
- Classification TreeA tree that breaks each input into partitions and sub-partitions so you can combine them systematically.
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