Ever wrote a 10 page document, looking it over again and again, not seeing a single error. And then hand it over to somebody else who finds an error within a minute in the first paragraph?
You did not see the problem because your brain had made assumptions about the content.
The same happens with software. You've already filtered out problem states when you start testing.
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People are bad at checking their own work.
Ever wrote a 10 page document, looking it over again and again, not seeing a single error. And then hand it over to somebody else who finds an error within a minute in the first paragraph?
You did not see the problem because your brain had made assumptions about the content.
The same happens with software. You've already filtered out problem states when you start testing.