Validity: a test is valid if it tests what it is supposed to test. T it is not valid, for example, to test writing ability with an essay question that requires specialist knowledge of history or biology unless own that all students share this knowledge before they do the test. A test is valid if it produces similar results to some other mensure Amat is if we can show that Test A gives us the same kind of results as Test B(or some other test) A test is only valid is there is validity in the way it is marked; if we score short written answers to a listening test for spelling and grammar, then it is not necessarily a valid test of listening. We are scoring the wrong thing A particular kind of validity that concerns most