An analysis of the conceptual feasibility of using automatic speech recognition and understanding technology in the design of an advanced training system was conducted. The analysis specifically explored application to Ground Controlled Approach (GCA) controller training. A systems engineering approach was followed to determine the feasibility of such a system. Design features were developed including training requirements and constraints. An evaluation of the state-of-the-art of speech understanding systems was conducted. The results of the study indicate that the technology for automatic speech recognition and understanding is adequate to warrant design and construction of a feasibility demonstration model for the precision approach radar (PAR) phases of GCA controller training. (NTIS)