The world of education can be considered a natural laboratory in which different countries are experimenting with different strategies. This report presents the findings of the First and Second International Association for the Evaluation of Educational Achievement (IEA) Science Studies. The book contains the following chapters: (1) Issues in Science Education; (2) Introducing Science in the Primary School; (3) Science for All in the Middle Secondary School; (4) Graduating from High School; (5) Learning Science; (6) The Science Curriculum; (7) Teachers of Science and Their Influence; and (8) Planning Science Education for the Future. (PR)