The Comprehensive School Mathematics Program (CSMP) is a program of CEMREL, Inc., one of the national educational laboratories, and was funded by the National Institute of Education (NIE). Its major purpose is the development of curriculum materials for grades kindergarten through 6. This volume describes the results of a series of mathematics achievement tests administered in spring 1980 to 31 CSMP and 25 non-CSMP classes. Report sections cover: 1) Setting; 2) The MANS Tests; 3) Methods of Analysis; 4) Comparison of Class Means; 5) MANS scores According to Reading Level of Student; 6) Graphs of District Means; and 7) New Students. There are two appendices: A) Statistical Data for Each MANS Scale; and B) Comparison of Results Using Different Units of Analysis. It is noted that within the 13 scale categories, there was a significnat CSMP advantage in 6 when one looks at either the whole category or at the proportion of individual scales that were significant. In 3, there were significant differences in favor of CSMP for the whole category. There were no significant differences in categories titled computation, most reasonable answer, measurement estimation, and organizing data. (MP)