The Human Use Regulatory Affairs Advisor (HURAA) is a Web-based facility that provides help and training on the ethical use of human subjects in research, based on documents and regulations in United States Federal agencies. HURAA has a number of standard features of conventional Web facilities and computer-based training, such as hypertext, multimedia, help modules, glossaries, archives, links to other sites, and page-turning didactic instruction. HURAA also has more intelligent features: an animated conversational agent that serves as a navigational guide for the Web facility; lessons with case-based and explanation-based reasoning; document retrieval through natural language queries; and a context-sensitive Frequently Asked Questions, called "Point & Query." This paper describes the major modules and features of HURAA and evaluates the performance of document retrieval through natural language questions. (Contains 21 references.) (Author)