"casual dismissal of coding errors as another cause of failures" It'd not casual dismissal. What she says that despite how good a job developers do, not unders

"casual dismissal of coding errors as another cause of failures" It'd not casual dismissal. What she says that despite how good a job developers do, not understanding the basic domain where the software operates will lead to a failure in production environment. Which, really, makes sense. Requirements drive the test envelope. Generally, people try to test the product they are releasing - but if they do not foresee a testable scenario then that is not tested. The best way to let bugs slip through is not to test against them.