Grace is an intelligent tutoring system (ITS) that will be used to teach programming in Cobol to about 300 NYNEX Service Company employees a year. It is the first ITS to be built by an industry laboratory for use within that industry. Grace has been a successful development project primarily because of the focus on usefulness and the use of iterative design. This paper describes Grace as a case study of finding a place for an ITS, ensuring that the users find it useful, and using prototype-evaluate cycles.
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