Test-tool intrusiveness occurs when the TAS interacts with or affects the SUT sufficiently that system behavior under automated testing differs from normal operational behavior. CTAL-TAE warns that close coupling between the TAS and SUT can influence functionality or performance. With a high degree of intrusion, failures may therefore appear during automated testing that would not be present in production. Such false or automation-induced failures reduce confidence in the TAS and may force developers to reproduce failures manually before accepting them as genuine SUT defects. Although repeatability, configuration management, and test-data integrity are also relevant automation concerns, they are not the specific consequence identified for high tool intrusion. The syllabus explicitly identifies failures observed during testing but not evident in production as a possible outcome of excessive intrusiveness.
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