Between 1980 and 1982, the International Association for the Evaluation of Educational Achievement (IEA) Second International Mathematics Study (SIMS) collected data on mathematics curricula, teaching practices, and achievement from samples of students, teachers, and schools in 18 countries. This material is a technical supplement describing the curriculum and organization of mathematics in each participating system in a way that permits interpretation of the "outcomes profile" of each system. Chapters included are: (1) "System Profiles" (describing school systems, teacher qualifications, mathematical content/materials, and examinations and control in each of 18 countries); (2) "Cognitive Item Tables"; (3) "Definitions of International Subtests"; (4) "Appropriateness Ratings Tables"; (5) "Indices of Intended Coverage"; (6) "Teacher Opportunity-To-Learn Ratings Tables"; and (7) "Indices of Implemented Coverage." (YP)