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CO poisoning is not easily diagnosed because early symptoms are nonspecific ( e.g ., headache , dizziness , weakness , nausea , visual disturbances , and confusion ) ( 2,3 ) . Is the area unmapped because it is a restricted military installation or because access was denied ? Cisco ca n't be the same company I joined because , when I left , there were over 10,000 more people in it than when I joined . I joined because I wanted the opportunity to support and defend the United States . This means that the test plans and traceability matrixes available at the time of testing - - which are what we reviewed because they governed the scope and nature of actual testing performed - - did not adequately trace between test cases and the requirements to be verified .