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Objectivity: a set of fixed criteria that have to met and are the same for every member of the group tested. Rather true/false questions than open questions. Different testers will come to the same result
     - Results are not manipulated to show a desired result

Reliability: repetition of the test produces the same result, retest. Prerequisite: testee chosen by the same criteria
     - Repetition of the test doesn’t lead to other results

Validity: the test checks on what it is intended to, i.e. usefulness, meaningfulness, appropriateness
     - A vocabulary test doesn’t check on grammar