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In the first two sections of this paper we review the design philosophy which gives rise to these features, and sketch the system architecture which reflects them. Within this framework, we have sought to provide languages which are natural for typical users. The third section of this paper outlines one such application language, REL English. The REL system has been implemented at the California Institute of Technology, and will be the conversational system for the Caltech campus this fall. The system hardware consists of an IBM 360/50 computer with 256K bytes of core, a drum, IBM 2314 disks, an IBM 2250 display, 62 IBM 2741 typewriter consoles distributed around the campus, and neighboring colleges. Base languages provided are CITRAN (similar to RAND's JOSS), and REL English. A basic statistical package and a graphics package are also available for building special purpose languages around specific courses and user requirements.