All types of assessment instrument are subject to misuse, but misuse is more likely to occur when the stakes for a particular test are high. For example, tests that are used to determine whether students pass or fail are more likely to be misused than tests that are used by teacher for instructional planning. Because of the importance attached to tests results by parents and policymakers, teachers sometime experience excessive pressure to raise test scores, and in torn. Teachers may engage in questionable actions. Some of these of these actions and can result in meaningless tests results.