The results of a multistep process to begin identifying best practices in deaf education are presented. To identify current practices, a survey was conducted of the literature, the Web sites of professional organizations, and states' education Web sites, which yielded a number of commonly discussed practices. Ten of the more highly cited practices in literacy instruction and 10 of the more highly cited practices in science and mathematics instruction were identified for additional scrutiny. Hundreds of articles were examined to identify research support for the 20 identified practices. Some practices had adequate research support; others had minimal support. The authors identify each of the 20 practices, describe the practice, present a summary of the literature that was examined, and rate the usefulness of the knowledge base relative to a "best practice" designation.