Validity.
It is the standard measure in which a test can be proved as effective; if the content, criteria, and construction of a test, plus the results of that test are reliable, and thus all of the students can be evaluated with it we can say it is a valid test.
Reliability.
It’s a crucial element in the assessment tool which proves how trusty a test is, how students respond to the tasks asked for, if its design is adequate or not to give learners good results and how constant their studying strategies are.
Practicality.
It is mainly how a test is first designed and then constructed, how extent it is or its briefness. The materials it will require and the accuracy of the meanings/questions.
Backwash.
Is the effect that a test has on the learning/teaching process, it demonstrates how the students have acquired the new knowledge, and how the teachers can facilitate that process.
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