This report provides an overview of the Oklahoma School Testing Program (OSTP) and summarizes students' average writing assessment scores from 1987 through 1993. In 1992, the Stanford Writing Assessment replaced the MAT-6 Writing Test as the instrument for measuring writing achievement for 7th and 10th graders in Oklahoma. Student papers were hand scored through holistic and analytic approaches to assess different aspects of composition skills. The combination of the two approaches provides teachers with a variety of performance data that can be used to assess student writing skill strengths. Comparison of students' holistic scores with the national average for the past 7 years indicates continued above average performance at both grades tested. The majority of the 1993 7th and 10th graders scored closer to the national average than their predecessors, although Oklahoma students continued to perform at or above the national norm of the 50th percentile. Use of the newly normed unimodal prompts of the new 1992 assessment has resulted in scores that are closer to the national average. Seven tables and eight figures present test results and allow comparison with national scores and Oklahoma scores from preceding years. Four appendixes present additional information in table form about the percent of scores under the normal curve and the performance of students in both grades. (SLD)