The statement that independent testing is necessary because developers don’t know any testing is wrong. Developers do know some testing, as they perform unit testing and component testing on their own code. However, independent testing is beneficial because it can provide a different perspective and a higher degree of objectivity than testing done by developers. Independent testers may have different skills, knowledge, experience, and expectations than developers, which can help them find different types of defects and improve the quality of the system.
References: Certified Tester Foundation Level Syllabus, Section 2.2
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