To determine test-retest reliability, it is necessary to have two different forms of a test.

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Test-retest reliability refers to the consistency of scores on the same test given twice to the same individuals. Therefore, there is no need for two different forms of a test. Instead, the same test is administered on two different occasions, and the scores obtained both times are compared to assess the test's reliability.

To Determine Test-Retest Reliability, It Is Necessary to Have Two