Safety-Critical Systems CTEL-TM-SM Practice Questions (Page 3)

Questions 11–15

1. 11foundation · easy

   Which documentation artifact is most important for demonstrating compliance with safety standards?

   • AA detailed project schedule showing when tests were executed.
   • BA list of all testers and their qualifications.
   • CA traceability matrix linking safety requirements to test cases and results.
   • DA summary of the test environment configuration.
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2. 12expert · hard

   A test manager is overseeing the verification and validation of a railway interlocking system. The verification activities have confirmed that the software meets its specification, but validation testing with train operators has revealed that the operator interface is confusing and could lead to incorrect commands during high-workload situations. What is the most appropriate action for the test manager?

   • ADocument the issue but proceed with release because the system meets its verified specification.
   • BTrain the operators to use the interface correctly and continue with the release.
   • CConduct additional verification testing to confirm the interface works as specified.
   • DReport the validation findings and initiate a change request to redesign the operator interface, then re-verify the affected requirements.
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4. 13expert · hard

   A medical device company is developing a wearable insulin pump with a mobile app for patients to control their dosage. The pump itself has safety mechanisms, but the app is the primary interface for patients. Usability testing revealed that some elderly patients struggle to navigate the app and occasionally enter incorrect dosage values. The test manager must decide how to address this risk. Which approach is most appropriate?

   • ARequire patients to attend a training session before using the app.
   • BLimit the app's functionality to only allow preset dosage values, removing manual entry entirely.
   • CAdd a warning message in the app manual advising patients to double-check their dosage entries.
   • DRedesign the app interface with larger buttons, clearer labels, and confirmation dialogs, then re-test with the target user group.
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5. 14foundation · easy

   Why is usability testing important in safety-critical systems?

   • ABecause usability testing is the only way to find defects in the system.
   • BBecause operator errors can lead to hazardous situations, and usability testing helps identify and mitigate these risks.
   • CBecause usability testing replaces the need for functional testing.
   • DBecause usability testing is required by all safety standards.
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6. 15foundation · easy

   In a safety-critical system, which activity is an example of validation?

   • AExecuting unit tests to verify that individual modules produce the expected outputs.
   • BPerforming a code review to check for coding standard violations.
   • CConducting a user acceptance test with representative operators to confirm the system supports their workflow safely.
   • DReviewing the software design to ensure it correctly implements the safety requirements.
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