The Department of Defense (DoD) established the Joint Advanced Distributed Learning (ADL) Co-Laboratory to support the implementation of ADL within DoD. As part of this initiative, the Joint Co-Laboratory is to provide technical assistance to program managers responsible for the development and fielding of ADL systems. This paper describes one of the efforts under this initiative. The goal of this project is to establish documented guidelines for the design and evaluation of Internet-based training and performance aiding. These guidelines are being developed for the Joint ADL Co-Laboratory by the University of Central Florida's Institute for Simulation and Training. The guidelines are being identified by reviewing the literature on development of web-based instructional environments, web-site development and computer-based training, including issues relating to content, format, instructional support features, standards compliance, learning management, tutoring, usability, hardware, and instructor and trainee skill requirements. Procedures for evaluation of ADL materials are discussed, and a sample of the preliminary guidelines is provided.