What is not required for a psychological test?

A psychological test is a standardized measure of a sample of a person's behavior that is used to assess a person's psychological characteristics. To be considered a valid and reliable psychological test, it must meet the following criteria:

• Reliability: The test must be consistent in its measurement of the target construct. This means that the test should produce similar results when administered to the same people at different times or by different examiners.
• Validity: The test must actually measure what it is intended to measure. This means that the test should correlate with other measures of the target construct, and it should be able to discriminate between people who have different levels of the construct.
• Norms: The test must have norms, which are scores from a representative sample of the population that can be used to compare an individual's score to the scores of others.

There is no requirement that a psychological test be developed by a renowned personality. In fact, many psychological tests are developed by researchers who are not well-known to the general public.

Therefore, the answer is It must be developed by some renowned personality.