Abstract: As we all know that IT is critical to business growth as it enables business model to scale and enhances the ability of the organization to successfully manage the complexity of the organization and its various processes. This study attempts to review the CIO�s role in increasing and maintaining the competitive advantage of the company. The study discusses the functional and technical scope of the CIOs role based on the operating model, enterprise architecture and IT engagement model. The study further discusses about how the role of CIO has evolved in recent years and continues to evolve even further keeping in mind the complexities of the business and its processes. Finally, the study discusses about how CIOs need to step up to make a constructive effort in the era of constantly evolving technological landscape and make an impact in improving the operational efficiency of the company.