2 Expert System Develop- ment
In the expert system development (see Figure l), between the steps of knowledge elicitation and modelling, there is a feedback loop repre- senting the adjustment of inconsistencies due to misunderstanding between the domain experts and the knowledge engineer. There are also back loop opportunities for other steps for improving the model and the codes. The field trials review the prototype system and provide the domain experts and knowledge engineers with advice to improve the knowledge base. The fundamental goal of knowledge based ap- proach is to develop an expert program that is capable of solving problems at least as good as human experts.