Reliability Analysis for the Internationally Administered 2002 Series GED (General Educational Development) Tests Reliability refers to the consistency, or stability, of test scores when the authors administer the measurement procedure repeatedly to groups of examinees (American Educational Research Association [AERA], American Psychological Association [APA], and National Council on Measurement in Education [NCME], 1999). If a given test yields widely discrepant scores for the same individual on separate test administrations, and the individual does not change significantly on the measured attribute, then the scores on the test are not reliable. Conversely, if a test produces the same or similar scores for an individual on separate administrations, then the scores from the test are considered reliable. Reliability is inversely related to the amount of measurement error in test scores. That is, the more measurement error present in test scores, the less reliable the test. Reliability is a crucial index of test quality. Standard practices require test developers to evaluate and report the reliability of their test scores. The purpose of this report was to estimate and evaluate the reliability of the internationally administered 2002 Series GED Tests, which have been developed and maintained by the GED Testing Service (GEDTS) since 1963. (Contains 3 tables and 3 footnotes.)