Chapter 4 – Test Analysis and Design
Boundary Value Analysis – ISTQB Definition
Last Updated: July 12, 2026 · SoftwareTestPilot QA Team
Official ISTQB Definition
A black-box test technique in which test cases are designed based on boundary values. Boundaries are the minimum and maximum values of an equivalence partition, plus the values just outside those boundaries.
In simple words
Bugs 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.
Exam tip
In CTFL v4.0, 2-value BVA tests the boundary and its nearest neighbour outside the partition; 3-value BVA also adds the neighbour inside.
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.
- Decision Table TestingWhen behaviour depends on combinations of conditions (like discount rules), you list every condition and expected action in a table and turn each column into a test case.
- Black-Box TestingYou design tests only from the spec or behaviour — inputs and expected outputs — without looking at the code.
Practice this term in the ISTQB Mock Test
40 CTFL v4.0 questions, 60-minute timer, instant scoring and chapter-wise breakdown.
Practice in Mock Test