“…Liang, Mgwatu and Zuo (2001) extend the study of Wang, Zuo, Qi, and Liang (1996) on determination of optimal process parameter settings for multi-pass turning operation. Hui et al (2001) show how the choice of machining conditions for turning significantly impact on quality cost, by solving a nonlinear continuous constrained optimization problem using a nonlinear optimization search algorithm, based on quasi-Newton method and a finite difference gradient. Many other iterative mathematical search algorithms with their applications are reported in the literature, such as geometric programming approach (GopalaKrisnan & Al-Khayyal, 1991), and Nelson-Mead simplex search approach (Agapious, 1992a,b & c).…”