This is one of a series of monographs developed by teachers in schools near Leeds, England. It reports on a 4-year examination of possible levels of attainment in mathematics at all ages of compulsory education. It has been planned according to the age of the pupil, and at three levels corresponding to below average, average, and above average pupils. An introductory chart indicates at what stage in a pupil's career a particular mathematical topic could be introduced, but it does not cover revision or reintroduction of the topic, a matter which is left to the discretion of the teacher. The headings have been chosen to cover the full range of the project and therefore certain topics and vocabulary might not be appropriate in some age groups. In all, 36 stages are outlined, with the topics to be included at each stage presented. An appendix outlines the metric system. (MNS)