This guide provides effective practices for anyone — university faculty member, K–12 teacher, or administrator — who wants to create a project that partners science, technology, engineering, and mathematics (STEM) graduate students (Fellows) with K–12 teachers on a sustained basis. These recommendations come from the community of faculty members, graduate students, K–12 teachers, program managers, and evaluators who participated in the U.S. National Science Foundation (NSF) Graduate STEM Fellows in K–12 Education (GK–12) Program from its start in 1999 through 2012. The guide was written to