CT-PT: Certified Tester Performance Testing

By ISTQB · Question Mode

QuestionQ22

Performance Testing Tasks

You are leading the testing effort for a system that controls the air/fuel ratio of direct-injection fuel devices designed specifically for high-altitude rescue helicopter engines. At altitude, the system must perform sufficiently to make enough air/fuel-ratio adjustments per millisecond between fuel and both an on-board source and available ambient air, preventing an engine stall caused by oxygen starvation. The system follows a sequential development lifecycle.

Stakeholders were dissatisfied with earlier performance-test results, which showed that adjustments were not made quickly enough and that an engine stall was probable. The developers have now made changes they believe will significantly improve adjustment performance.

What should you do to ensure the performance-test objectives are properly defined before running the next set of performance tests?

Explanation

Performance-test objectives should specify a measurable expected improvement relative to the previous baseline. Defining the delta between the prior results and the expected post-change results provides a testable performance target for the adjustment rate and verifies whether the change addresses the safety-critical stall risk. ISTQB performance testing guidance emphasizes defining performance goals and requirements to meet stakeholder needs and expectations.

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