The Tests of General Educational Development (GED Tests) are used throughout the United States and in much of Canada as a basis for awarding high school level equivalency credentials to adults who did not graduate from high school. The paper summarizes much of the available information concerning the reliability and validity of the GED Tests. These data were gathered in a number of studies conducted between 1978 and 1984. Results are given for both internal consistency and parallel forms reliabilities as well as for many aspects of validity. The data suggest that the test results are sufficiently reliable for continued use and that the validity evidence generally supports the intended uses of the tests.
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