The three basic requirements of a scientifically acceptable achievement, aptitude, or intelligence test are standardization, reliability, and validity.

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Standardization ensures that the test is administered and scored consistently for all test-takers, reliability measures the consistency of scores over time and across different test-takers, and validity determines whether the test measures what it is intended to measure. These three requirements are essential for a scientifically acceptable test.

The Three Basic Requirements of a Scientifically Acceptable Achievement, Aptitude