Which goals and standards guide science education across the world? This first report of the Third International Mathematics and Science Study (TIMSS) explores this question by examining the data collected in the TIMSS Curriculum Analysis. The study includes a page-by-page inventory of science content and other pedagogical characteristics collected from textbooks and curriculum guides from almost 50 countries. This data documents many important features of these countries' mathematics education curricula. The book examines important features of curriculum policy across the TIMSS countries, especially the role of textbooks and curriculum guides. It also portrays similarities and differences in science curricula in the succession of objectives across grades. Additionally, it details characteristics of the science curriculum as embodied in textbooks and curriculum guides intended for select grades.