Criterion Validity

Some times a test is used to predict future performance or is used in place of another test that is perhaps longer or requires more elaborate equipment or facilitie. The terms predictive validity and concurrent validity also have been used to designate these concepts. Both are based on a criterion that is considered to represent the performance or characteristics in question. A college enterance examinition ia an example of a test that attemps to predict success in college, which is the criterion.
From Wikipedia .(In psychometrics, criterion validity is a measure of how well one variable or set of variables predicts an outcome based on information from other variables, and will be achieved if a set of measures from a personality test relate to a behavioral criterion that psychologists agree on. A typical way to achieve this is in relation to the extent to which a score on a personality test can predict future performance or behaviour. Another way involves correlating test scores with another established test that also measures the same personality characteristic.Criteria or concrete validity is the extent to which the measures are demonstrably related to concrete criteria in the "real" world. This type of validity is often divided into "concurrent" and "predictive" subtypes. The term "concurrent validity" is reserved for demonstrations relating a measure to other concrete criteria assessed simultaneously. "Predictive validity" refers to the degree to which any measure can predict future concrete events. These variables are often represented as “intermediate” and “ultimate” criteria. For example, let us say we are conducting a study on success in college. If we find out there is a high correlation between student grades in high-school math classes and their success in college (which can be measured by many possible variables), we would say there is high criterion-related validity between the intermediate variable (grades in high-school math classes) and the ultimate variable (success in college). Essentially, the grades students received in high-school math can be used to predict their success in college.)