... the test may be valid for some purposes, but not for others. For example, if the purpose of a test is to test ability to communicate in a foreign language, then it is valid if it actually tests ... If the test is full of questions of grammar, then the test cannot be considered valid. Moreover, if a test is to test reading ability, but it also tests writing, for example, then the test fails ... are achievement tests, proficiency test, and so on. In fact, the same form of test may be used for different purposes, although in other cases the purpose may affect the form.Due to the limitation...