Test Design Techniques interview questions — Hard
173 hard-level Test Design Techniques questions from our Manual Testing bank, each with the correct answer and an explanation of why it is correct.
What this covers
Test Design Techniques appears throughout Manual Testing interviews. At hard level, interviewers are typically checking depth under pressure — edge cases, failure modes, performance characteristics, and the trade-offs you accepted. Work through these, then explain your answer out loud; the second part is what interviews actually test.
4 example questions
1. Regarding Test Design, which of the following is a false statement?
- A. State transition testing validates behavior across states and events, including invalid transitions.
- B. Pairwise testing requires testing all possible combinations of all parameters.correct
- C. For an input range 1-100, boundary tests include 0, 1, 100, and 101.
- D. Pairwise (all-pairs) testing covers every pair of parameter values with far fewer tests than all combinations.
Why: The selected statement is false. The other options are accurate statements about Test Design.
2. Which of the following statements about Test Design is FALSE?
- A. For an input range 1-100, boundary tests include 0, 1, 100, and 101.
- B. Decision tables model combinations of conditions and their resulting actions.
- C. Error guessing leverages tester experience to target likely failure areas.
- D. State transition testing applies only to stateless systems.correct
Why: The selected statement is false. The other options are accurate statements about Test Design.
3. Identify the INCORRECT statement about Test Design:
- A. Pairwise testing requires testing all possible combinations of all parameters.correct
- B. Decision tables model combinations of conditions and their resulting actions.
- C. Error guessing leverages tester experience to target likely failure areas.
- D. Classification tree and cause-effect graphing are systematic black-box combination techniques.
Why: The selected statement is false. The other options are accurate statements about Test Design.
4. Which statement about Test Design is NOT correct?
- A. Equivalence partitioning divides inputs into classes expected to behave the same, testing one value per class.
- B. Pairwise (all-pairs) testing covers every pair of parameter values with far fewer tests than all combinations.
- C. Boundary value analysis ignores the edges of input ranges.correct
- D. Error guessing leverages tester experience to target likely failure areas.
Why: The selected statement is false. The other options are accurate statements about Test Design.