Definition:
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Test validity helps ensure that a test is in accordance with certain professional standards to measure what it is supposed to measure. In other words, it tells us how much a test measures what it is supposed to be measuring. There are two main methods to demonstrate a test's validity. One is criterion validity and the other is content validity.
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Criterion validity
assesses whether a test reflects a certain set of abilities. For instance, when an employer hires new employees based on normal hiring procedures like interviews, education, and experience. This method demonstrates that people who do well on a test will do well on a job, and people with low score on test will do poorly on a job.