The Iowa Norming Study determined how well graduating high school seniors (N=722) performed on the revised 1988 Tests of General Educational Development (GED), providing the data to describe and evaluate the score requirements for GED Test candidates in terms of the percentage of Iowa high school graduates a GED Test candidate must exceed to obtain the Iowa High School Equivalency Diploma. A second purpose was to evaluate and potentially revise the Iowa minimum score requirements for the Iowa High School Equivalency Diploma. The related Iowa GED Candidate Impact Study determined the impact of different levels for minimum score requirements on the passing rate for GED Test graduates and candidates as a whole and the impact of different passing scores on subgroups of candidates. The studies clearly indicated higher pass rates for GED candidates, considered a direct result of the instructional program offered through Iowa's community colleges, than for high school seniors. The current minimal standard of 35 and 45 could be raised to 40 and 45 without having a significant negative impact on the candidate population. Such a standard would satisfy the 70-72% pass rate criteria of the norm group of seniors. Thirteen tables and six figures give the data for high school seniors and GED Test candidates. (SLD)