Information is provided for educators and the general public about the performance of students on the standardized tests administered in 1990 as part of the South Carolina Norm-Referenced Testing (SCNRT) Program. The first section of this report provides background information necessary for interpretation of the results. The second section reports the results of the 1990 assessments. Since 1983, South Carolina administered the Comprehensive Tests of Basic Skills, Form U (CTBS/U) as part of the SCNRT Program. However, in 1989, the state adopted the Stanford Achievement Test Series, Eighth Edition (Stanford-8). In March 1990, both the Stanford-8 and the CTBS/U were administered to students in grades 4, 5, 7, 9, and 11. The CTBS/U was administered for the last time for comparison purposes; the Stanford-8 was administered as a pretest for 1991 program evaluations and to provide baseline scores for the next 5 years. Because of the double testing, the full battery of subtests was not used for all grades. In all, 224,980 students took the CTBS/U, and 224,055 students took the Stanford-8. Two tables and 10 bar graphs summarize the study results. Appendices A through G present the test results by school district and by grade on 159 pages of tables and 9 additional bar graphs. Appendix H provides cautions in interpreting test results, Appendix I presents a glossary, and Appendix J discusses the phenomenon of changing norms. (SLD)