“…Due to several factors such as complexity of dynamics, incomplete uncertain knowledge and diverse sources of knowledge, many diagnostic methods and techniques are adopted in fault diagnosis research and development work. These methods and techniques can briefly be classified into the following: rule-based (Cho, Ahn, & Chung, 2003;El Gamal & Abdulghafour, 2003;Jämsä, Jounela, Vermasvuori, Endén, & Haavisto, 2003), knowledge-based (Cho et al, 2003;Ruiz et al, 2001), modelbased (Ding, Fennel, & Ding, 2004;Liu & Coghill, 2005), case-based (Cunningham, Smyth, & Bonzano, 1998), neural network (Mohamed, Abdelaziz, & Mostafa, 2005;Yang, Han, & An, 2004), rough set theory (Tay & Shen, 2003;Wang & Li, 2004), fuzzy logic (Dash, Rengaswamy, & Venkatasubramanian, 2003;Tarifa & Scenna, 2004) and statistical method (Yang, Lim, & Tan, 2005).…”