Wire electrical discharge machining (WEDM) is a successful advanced machining method in the field of hard and difficult to machine newer materials especially, metal matrix composites (MMC).Using WEDM technology, complicated profiles can be cut in electrically conductive component. The higher degree of precision, accuracy and fine surface quality obtained makes WEDM indispensible in modern manufacturing system. Tungsten Carbide Cobalt (WC-CO) metal matrix composite is widely used in the field of tool and die, auto, aeronautical and space applications. In this study WC-Co was cut by WEDM with the motive to identify the best input parameters that produces best output. Many works been done in WEDM modeling and optimization but yet, studies on influencing parameters, judicious selection of the machining conditions, their levels and analysis for a particular pattern of behavior is still not much ventured in. Experiments were conducted under different combinations of input variables such as percentage of cobalt in the composite, pulse ON time, delay time, wire feed, wire tension, ignition current, and dielectric pressure and the significant parameters and the causes are analyzed. This analysis offers insight into the wedm process, particularly, the machining of metal matrix composite WC-Co, the influential input parameters, their level play on the outputs such as material removal rate (mrr) and roughness (Ra), which are of critical importance in any machining operation. The results show careful selection of operating parameters for a particular (composite) material can enhance quality of machined component