The Peterborough County Board of Education Mathematics Project is a system-wide curriculum project aimed primarily at basic skills and problem solving in grades K-10. The philosophy of the developers includes a broad conception of curriculum. Their goals include the articulation of educational goals, the establishment of relationships among goals, the creation of instructional procedures to meet these goals, and the generation of means of evaluation. In addition, they have a major interest in implementation as a part of curriculum design. Therefore, they consider the inevitable changes in materials made intentionally or unintentionally by teachers in the field as a part of the development. In this paper the history of this project is analyzed in terms of stages, the curriculum constructs are examined, and the products and evaluation procedures are discussed. The basic skills component of the project, based on 600 behavioral objectives with 10 equivalent test items per objective, is currently used by 80 percent of the relevant teachers in the system. (SD)