Wireless sensor networks are a specialized type of computer networks which are typically employed to perform monitoring tasks. one of the most significant issues is related to energy consumption. Due to the presence of a large number of sensors in a network and lack of access to them, it is not feasible to replace sensors or re-charge their batteries. Therefore, a fundamental issue in the design of such networks is the limited energy resources for sensors, thus requiring provision of strategies aimed at optimizing energy consumption that would eventually lead to an increase in network lifetime.This paper is aimed at optimizing selection of cluster heads using fuzzy-logic , thus leading to an increase in network lifetime