This guide contains materials to help teachers understand and use the reports from the Delaware Student Testing Program (DSTP). In spring 1998, the Department of Education, in conjunction with Harcourt Educational Measurement, began its annual administration of the DSTP reading, writing, and mathematics tests for students in grades 3, 5, 8, and 10 to provide an accurate measure of how students are doing relative to Delaware's rigorous content standards. In spring 2000 the science and social studies tests were administered in grades 8 and 11, and a version of these tests designed for grades 4 and 6 were administered in fall 2000. This guide contains the following sections: (1) "Introduction to the DSTP"; (2) "Understanding the English Language Arts Report"; (3) "Understanding the Mathematics Report"; and (4) "Understanding the Science and Social Studies Report." For each subject area, information is provided about individual, school summary, and district summary reports, and norms, score comparisons, and the instructional needs identified by the reports. Ideas are provided for using the identified instructional needs and test performance analyses at the appropriate grades. One appendix contains sample reports from Harcourt Educational Measurement. A second appendix contains samples of items for each part of the DSTP, and the third appendix contains sample district reports. (SLD)