This website describes the Natural Language Program that is part of SRI International's Artificial Intelligence Center. The center's research focuses on natural language theory and applications, with emphasis on three subgroups of study. The subprogram on Multimedia / Multimodal Interfaces seeks to understand the optimal ways in which natural language can be incorporated into multimedia interfaces. The subprogram on Spoken Language Systems integrates linguistic processing with speech recognition for use in ATIS, a system for retrieving airline schedules, fares, and related information from a relational database. The subprogram on Written Language Systems researches the problems involved in interpreting and extracting information from written text, such as on-line newspaper articles. Additional information on these projects, related publications, and software are available from this website.