Mathematics education has undergone many changes over the past few decades. Those changes are reflected in the curriculum materials that are currently available. This guide is intended to help the teachers, administrators, and parents of high ability mathematics students explore the materials on the market today. The guide gives a set of criteria for judging new materials and gives examples of different types of materials that meet those criteria. The National Council of Teachers of Mathematics (NCTM) has taken the lead in this area by writing its Curriculum and Evaluation Standards (1989) and its update, Principles and Standards for School Mathematics (2000). It is not a how-to guide but reflects the goals and principles that should guide and improve math programs at all levels. It is intended to help teachers, program administrators, and parents (who often provide an enrichment component for their children) locate and select materials for their high ability students that will appropriately enrich the study of mathematics. Since textbooks cannot be considered the sole source of curriculum, the use of this Resource Guide will facilitate the otherwise daunting search process. Users of this guide may use the annotated lists of recommended materials that appear in the guide to begin making resource decisions. They may also use the criteria review sheets contained in the guide to evaluate the utility of other materials. [ Document was prepared by Center for Gifted Education.]