This book contains a thorough study of wire electric discharge machining considering low carbon alloy steel as a work-piece and brass wire as an electrode. Significant control factors were found out by one factor at a time approach (OFAT). Response surface Methodology (RSM) was used for the planning of experiments and the optimization of the significant control factors. Analysis of variance (ANOVA) was used for the percentage contribution of significant control factors. Mathematical Models were made for various response variables (metal removal rate, surface roughness and dimensional deviation). Confirmation experiments were performed at the predicted optimal setting.