Abstract
Grace, the NYNEX COBOL tutor, is being built in a corporate environment following the philosophy of iterative design and test. Grace and the student interact in a mixed-initiative dialogue. Grace's side of the dialogue is controlled by a simulation based upon the ACT* theory of cognitive skill acquisition (Anderson, 1983, 1987b). This simulation is theory-driven and largely, but not completely, embodied in a production system architecture. The student-tutor dialogue is mediated by an interface whose design is empirically driven and embodied in a multi-media system of windows, text, hypertext, mouse gestures, menus, node selections, typing-in, and so. Construction of the simulation and the tutor interface are being tested and revised through a series of user trials. The trials are conducted at one of the sites at which the tutor will be used. Students participating in the trial are from the same population as our target audience.
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