Supporting Root Cause Analysis with Defect Classification CTAL-TA Practice Questions (Page 1)

Questions 1–5

1. 1application · medium

   A test team is adopting the Orthogonal Defect Classification (ODC) scheme. They have started classifying defects by 'trigger' and 'impact'. The test manager wants to use this data to improve the test process. Which analysis of ODC data would be most useful for this purpose?

   • AReplace the defect tracking system with ODC to eliminate manual classification effort.
   • BUse the impact field to rank defects by severity and assign them to developers.
   • CCompare the distribution of triggers across releases to identify which test activities are less effective at finding defects.
   • DCount the total number of defects per module to decide which module to rewrite.
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2. 2foundation · easy

   Which of the following is an example of a common defect classification scheme used in root cause analysis?

   • AOrthogonal Defect Classification (ODC)
   • BEquivalence Partitioning (EP)
   • CPairwise Testing
   • DTest Case Prioritization (TCP)
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4. 3application · medium

   After a root cause analysis session, the team identifies that 70% of defects in the last release were caused by unclear acceptance criteria. The test manager wants to recommend a process improvement. Which recommendation is most likely to prevent these defects?

   • AIntroduce a checklist for writing acceptance criteria that includes verifiable and testable conditions.
   • BAsk developers to write more unit tests to catch defects earlier.
   • CDelay the release to allow more time for testing.
   • DIncrease the number of testers to find more defects during testing.
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5. 4foundation · easy

   After analyzing defect classification data, a test team notices that a large percentage of defects originate from incomplete requirement specifications. Which process improvement would most directly address this root cause?

   • ASwitch to a different test automation tool
   • BEnhance requirements review and validation activities
   • CIncrease the number of test cases executed per release
   • DReduce the frequency of regression testing
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6. 5expert · hard

   A team is using a fishbone diagram to analyze a high-severity defect that caused data loss during a database migration. The diagram has six categories: People, Process, Tools, Environment, Data, and Measurement. During the session, the team identifies 'insufficient testing' as a potential cause. The test manager wants to ensure the analysis leads to actionable process improvement. What is the most important next step?

   • ARemove 'insufficient testing' from the diagram because it is a process issue, not a technical cause.
   • BStop the session and assign the defect to the database administrator who performed the migration.
   • CDrill down on 'insufficient testing' to identify specific testing gaps, such as missing migration test scenarios or inadequate test data.
   • DConclude that the root cause is insufficient testing and recommend adding more testers to the team.
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