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The authors developed and evaluated an expert system-based training system using Information Systems Design Theory (ISDT). First, an Expert System for Training (EST) was designed and implemented, and then a version of EST without expertise features, called IST, was also created. In order to evaluate which training system (if any) delivers better training, a three-group quasi-experiment was used. Each group was trained to use Statistical Process Control (SPC). One group was trained using the EST; outcomes for this group were significantly the highest among the three. A second group was trained using the IST; outcomes were not as high as the first group but significantly higher compared with the control group. The control group was trained with traditional means. Results show that the ISDT led to a useful purposely- developed application for enhancing the training of workers who have limited education but need to know about a very specific and complex field where the availability of trainers is limited. The authors call for further research that uses this ISDT to build purposely-developed software to support training of complex tasks. Keywords: Expert Systems, Information Systems Design Theory (ISDT), Information Systems Development, Statistical Process Control (SPC), Training, INTRODUCTION This paper reports the development of an information systems design theory (ISDT) for an expert system to support worker training. It describes design research that produced a system to [...]