The United States Department of Education's National Diffusion Network (NDN) assists public and private educational institutions in sharing exemplary programs, products, and processes. The staff development and teaching strategies offered by NDN projects are intended to renew and enhance elementary and secondary teachers' knowledge and approaches to teaching. This guide is a collection of 64 exemplary NDN programs in mathematics, science, and technology. Entries contain a description of the program, including grade level, content area, dominant instructional emphasis, curriculum scope, teacher training time required to adopt the program, types of follow-up or professional development offered to schools adopting NDN programs, costs, and contact information. (MKR)