Criterion-related validity is a measure of how well one test predicts outcomes based on another established test. It assesses the effectiveness of a new assessment by comparing it to a benchmark, known as the criterion. This type of validity is crucial in determining whether a test can accurately forecast performance in a specific area. There are two main types of criterion-related validity: concurrent validity and predictive validity. Concurrent validity examines the relationship between the new test and the criterion measured at the same time, while predictive validity looks at how well the test forecasts future performance. Both types help ensure that assessments are reliable and useful.