10-16 Reliability validity Selection tools must be reliable and valid o Reliability: the degree to which the tool measures the same thing each time it is used Scores should be close for the same person taking the same test over time Validity: Does the test measure what it is supposed to measure a Example: does a physical ability test really predict the job performance of a firefighter Managers have an ethical and legal duty to develop good selection tools " win/MeGraw-HHill CThe McGraw-Hill Companies, Inc, 200010-16 Irwin/McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000 Reliability & Validity ◼ Selection tools must be reliable and valid. ◆ Reliability: the degree to which the tool measures the same thing each time it is used. ◼ Scores should be close for the same person taking the same test over time. ◆ Validity: Does the test measure what it is supposed to measure? ◼ Example: does a physical ability test really predict the job performance of a firefighter? ◆ Managers have an ethical and legal duty to develop good selection tools