... al., 2000, Firat, 2007a) and use less computer resources, since the Expert Systems for Human, Materials and Automation 150 Fig. 8. Polynomial fit estimation and confidence bounds of ... 2000). Expert Systems for Human, Materials and Automation 162 An expert system must have compulsory three main modules that form the so-called essential system: • Knowledge base formed ... Materials Processing Technology, Vol. 50, No. 1-4, pp. 1 68- 179, ISSN 0924-0136 Expert Systems for Human, Materials and Automation 1 48 This part of the software is divided in three steps. In...