The concept of three curriculums--intended, implemented, and attained--is central to this report. In the second international mathematics study, students were surveyed at age 13 (grade 8 in the United States) and in the terminal grade of secondary schooling; this analysis is limited to the first group. How each of the three curriculums was assessed is discussed. The intended and implemented content coverage is briefly discussed, with a table showing differences between the coverage for arithmetic, algebra, geometry, statistics, and measurement for 16 countries. Differences between student and teacher indices are shown in a table. The attained curriculum is discussed in detail, including appraisal by type of items. For most countries and for most mathematics topics, intention runs ahead of implementation. Teachers agreed with students on what had been taught in algebra and measurement, but on the other three topics there were a large number of items showing discrepant results. The appendix includes 23 data tables. (MNS)