This is one of a series of reports which provide definitions of and descriptive data on the variables used in the Comparative Study of Phase IV of the Individually Guided Education (IEG) Evaluation Project. Phase IV investigated three curriculum programs specifically designed to be compatible with instructional programming for the individual student: (1) the Wisconsin Design for Reading Skills Development (WDRSD); (2) Developing Mathematical Processes (DMP); and (3) Prereading Skills (PRS). Information on instructional methods and pupil outcomes for grades 2 and 5 was collected from achievement monitoring and domain referenced tests, teacher logs, and classroom observations. This paper focuses on a single variable: mathematics achievement. It reports data by schools and by school type and curriculum group for the eight achievement monitoring test administrations and the three domain-referenced test administrations. The achievement monitoring test results are reported by the general objectives tested (seven for grade 2, nine for grade 5). The domain referenced test results are reported by the three basic objectives and include domain and item difficulty. Appendixes, the bulk of the document, include the test forms administered during the Comparative Study, Phase IV. (BS)