Chapter 4 – Test Analysis & Design
Input Partition – ISTQB Definition
Last Updated: July 12, 2026 · SoftwareTestPilot QA Team
Official ISTQB Definition
A portion of the input domain of a test object for which the behavior is assumed to be the same, based on the specification.
In simple words
A group of inputs the system should treat the same way — pick one representative to test the whole group.
Exam tip
Input partitions are what equivalence partitioning divides — one test per partition is the base coverage rule.
Related terms
- Equivalence PartitioningGroup inputs that the system should treat identically, then pick one value from each group. That way you cover behaviour without testing every possible value.
- Output PartitionA group of outputs the system produces the same way — used when designing tests from expected results, not inputs.
- Boundary Value AnalysisBugs cluster at the edges of allowed ranges. So if a field accepts 1–100, you test 0, 1, 100, and 101 instead of only picking a value from the middle.
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