Project management methodology is a set of established guidelines that are used for executing projects in every industry. They are broadly based on initiating, planning, organizing, executing, and monitoring & controlling process group. However, project management is carried out through nine project management knowledge areas i.e. integration, scope, time, cost, quality, human resource, communications, risk and procurement management. Projects are governed by certain factors that have major influence in directing the success or failures. Broadly cost, time & scope have been identified as key important success factors for projects. This research is carried out to identify the critical success factors in EPC/PC projects in Oil & Gas industry of Kuwait and to compare the results with previous established success factors.