Question 23

Question

Which of the following statements describes a key principle of software testing?

Accepted Answer

For a software system, it is normally impossible to test all the input and output combinations.

Jack O. · Answer

B

Ethan P. · Answer

Not convinced by A, since just automating tests doesn't guarantee confidence. B is the principle from ISTQB: you can't exhaustively test every input/output. C and D are classic traps. Pretty sure it's B, but open to discussion if anyone disagrees.

Leo E. · Answer

B , you just can't test all input/output combos in real world projects. It's a core ISTQB idea that exhaustive testing is impossible. Maybe I'm missing some edge case, but B matches what the syllabus says.

Ben · Answer

Can't test every possible input, so B fits here. That's one of the main ISTQB principles I always see. Full coverage isn't feasible, even with automation or tools. Pretty sure B is right, but let me know if someone disagrees.

ISTQB CTFL-Foundation v4.0 Real Exam Questions [October 2026 Update] Quiz

Which of the following statements describes a key principle of software testing?

Premium Access Includes