The 1998-99 school year marked the 19th year of statewide student testing under the Arizona Student Achievement Program. In this school year, students were tested using the Stanford Achievement Test, Ninth Edition (Stanford9). This test was administered to 593,872 Arizona students in grades 2 through 11 during the spring of 1999. Three subtests in reading, language, and mathematics were administered at all grade levels. This document provides school, district, county, and state level scores representing typical student performance. Sections A, B, and C of this report provide separate scores, one for each subject tested. The three scores cannot be averaged to provide one overall score for a school, district, county, or the state. They are percentile rank scores that indicate the estimated percentage of students nationally scoring equal to or lower than the average performance indicated for a school, district, county, or the state. These scores are presented in table form, one lengthy table for each of the three subtests in reading, mathematics, and language. (SLD)