Comprehensive Achievement Monitoring (CAM) is a systematic procedure of constructing and administering longitudinal, criterion-referenced tests. CAM has advantages over typical classroom testing of having well-organized tests, providing course evaluation through pretesting, posttesting, and retention measurement; producing data for continuous classroom instructional management; and being based on a curriculum of behavioral objectives. The systematic gathering of comprehensive performance data permits a means of establishing a dollar-and-cents cost analysis for various instructional and curricular alternatives. The costs of typical classroom testing and CAM are compared. (Author)