V. Reliability Testing
B. Testing during development
Describe the purpose, advantages, and limitations of each of the following types of tests, and use common models to develop test plans, evaluate risks, and interpret test results.
3. Reliability growth testing (e.g., test, analyze, and fix (TAAF), Duane) (Evaluate)
Especially useful for large complex systems, we can track the trajectory of the incremental improvements.
Additional References
SOR 050 Implementing System Reliability Growth (podcast)
9 Reliability Growth Patterns for Two Test Phases (article)
Reliability Growth Testing (article)
Duane Plot of Cumulative Failures Over Time (article)
Quick Quiz
1-136. Identify the important steps in the planning and conduct of a test, analyze, and fix program.
I. Fully analyze all failures.
II. Accept some failures as non relevant.
III. Dismiss no failure as random.
IV. Take corrective action on all failures.
(A) I and IV only
(B) II and III only
(C) I, III and IV only
(D) I, II, III, and IV
(C) I, III and IV only
The test, analyze, and fix program relies on finding, understanding and designing out or mitigating as many failures as possible. No failures are irrelevant.
If the unit under test was not setup properly, your customer will likely have setup related failures.
If the test technician drops a unit, it is likely your customer will drop the one they have.
If an engineer doesn’t understand an error message, users of the product will too.
If the device stops working briefly at 65°C in a thermal chamber, the underlying root cause may reflect a design flaw and just take longer to failure at lower temperatures.
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