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Test design techniques interview questions, 2026

Classic, comes up at every level. Be ready with technique names + examples.

Test design technique questions show up in every QA interview, from fresher to lead. The named techniques (Boundary Value Analysis, Equivalence Partitioning, Decision Tables, State Transition, Error Guessing) are not academic: each maps to a category of bug an unstructured approach misses. Know each name and a concrete example.

2 questionsIndia context · 2026
  1. Q1Explain Boundary Value Analysis with an example.
    What the interviewer is really listening for

    Looking for: explanation of why bugs cluster at edges, then a concrete example with values *on* and *just outside* the boundary.

    Sketch answer (adapt, do not memorise)

    Bugs cluster at edges of input ranges. For "age 18–60 allowed," BVA says test 17, 18, 60, 61 (and 0, 150 for extremes). I don't test 25 and 45 in isolation, those are equivalence partitioning representatives, not boundaries.

  2. Q2When would you use a decision table over equivalence partitioning?
    What the interviewer is really listening for

    Looking for: awareness that decision tables shine when behaviour depends on combinations of multiple conditions.

    Sketch answer (adapt, do not memorise)

    When behaviour depends on combinations of several independent conditions, like a "free shipping" rule that depends on member tier × cart total × destination region. EP/BVA shine on single-dimension inputs; decision tables ensure I don't miss a combination.

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