The National Diffusion Network (NDN) is a federally funded system that makes exemplary educational programs available for use by schools, colleges, and other institutions. This publication contains information describing the science education programs currently in the NDN, along with procedural information on how to access these programs. The…

This catalog is intended to make successful programs and practices available so that interested school districts may adapt and install their key elements. All programs were approved by program offices within their funding agencies and often by state education agencies. All were then carefully scrutinized for quality by the Joint Dissemination…