The UGESP requires that selection tests be reliable and valid predictors of success on the job.ReliabilityReliability measures whether a test or other measurement produces consistent results so that, over time, the scores won’t vary greatly. Test reliability is enhanced by several factors, including wording instructions and test questions clearly. Providing optimal conditions for administering the test contributes to its reliability, as does making sure it’s long enough to accurately test the candidate’s knowledge.