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Whether a test possesses content validity is a subjective judgment.content validity is,however,fundamental for tests that aim to measure what students have learned in a class.It must be kept in mind that a test represents a sampling of test items from a so-called universe of possible test items.Unfortunately it sometimes becomes a guessing game on the part of the students,who hope that the teacher will select a sample of items that correspondents to what they have been studying.A big difference between the test and the students exceptions may indicate either poor communication with respect to the course objectives or poor test construction.Content validity applies to physical performance tests as well as to written tests.
Further Reading
1. http://allpsych.com/researchmethods/
2. http://writing.colostate.edu/
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