This guide is intended to provide educators responsible for selecting elementary science curriculum materials for high ability learners with both quantitative and qualitative assessment data for 27 science curricula or materials. The review process attempted to balance sound practices of curriculum development (using standards required for any exemplary curriculum and any population), exemplary science practices (based on "new science" recommendations), and differentiation issues for high ability learners and other special populations. Introductory material of section I explains how to use the guide, how to integrate the guide with school and district goals, the categories of the reviewed curricula, and instructional emphases of curricula (e.g., reading based, inquiry based, interdisciplinary). Section II then provides evaluations of 13 comprehensive stand-alone curricula series. Section III evaluates seven modular programs and section IV offers evaluation of seven sets of supplementary materials. Each evaluation includes a narrative overview, an analysis, a conclusion, and results of comparative ratings by several reviewers. Appendices provide: a compilation of curriculum review ratings; the curriculum review process and criterial rating sheets; and an annotated 70-item bibliography of science curriculum materials. (DB)