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 the elementary grades. Beginning in 1973, CSMP ran an extended pilot trial of its elementary program. This report describes the results of administering a series of tests to nine fourth-grade CSMP classes in the St. Louis area and to eight comparison classes. The tests are collectively called the Mathematics Applied to Novel Situations (MANS) Test. The study was conducted in May 1978, at the end of a school year that constituted the first of 2 years of the Extended Pilot Trial (EPT) of CSMP fourth-grade materials. Results indicated that CSMP pupils did seem to be consistently better at certain kinds of tasks than non-CSMP students. (MP)