An ICAI architecture for troubleshooting in complex, dynamic systems

AHAB is an architecture for simulator-based ICAI)programs to teach troubleshooting in complex, dynamic environments. The architecture posits three elements of a computerized instructor: the task modet, the student model, and the instructional module. The task model is a prescriptive model of expert performance that uses symptomatic and topographic search strategies to provide students with directed problem-solving aids. The student model is a descriptive model of student p,-rforrance in the context of the task model. This student model compares the student and task models, critiques student performance, and provides interactive performance feedback. Finally, the instructional module coordinates information presented by the instructional media, the task model, and the student model so that cach studc ; ,"L.yz. hUAulViduL~ d instruction. Concept and metaconcept knowledge that supports these elements is contained in frames and production rules, respectively. The results of an experimental evaluation support the hypothesis that training with an adaptive online system built using the AHlAB architecture produces better performance than training using simulator practice alone, at least with unfamiliar problems. Furthermore, it is not sufficient to develop an expert strategy and present it to students using offiline materials. The training is most effective if it adapts to individual student needs. Accession For NTIS GRA&I DTIC TAB Unnnnounced Justificatio By Distribution/ Availability Codes 'Avai'L and/or Dist Special