The booklet was designed to help each recipient of the California Achievement Test (CAT) reports to understand the general format of the reports, the abbreviations and symbols used, and the types of scores presented. It was also intended to assist in interpreting CAT results and using these results at each level of the educational process to best benefit the students of the Memphis City Schools. A sample of each basic CAT report which is sent to school system personnel is included in this booklet. The contents discuss the format, interpretation and use of (1) the grouped Item Response Record, (2) the Objective Mastery Report (OMR), (3) CAT Results by Class, and (4) the OMR Season Summary. The use, advantage, and disadvantage of raw scores, percentile ranks, and stanines reported on the CAT, as well as, the Class Management Guide, are discussed. (PN)