In the organization, IT should be sustained and extended from the organization's strategy and objectives of business. Good IT governance can increase the effectiveness of IT utilization by aligning business and IT strategy. Organization also need to know what the role of IT to give understanding about the IT utilization consequences for business impact. The purpose of this study is to analyse the role of IT in IT governance practices maturity perspective which implemented in the organization. This study compose relevant maturity model based on theory of IT governance practices that have relation to two key dimensions of IT Strategic Impact Grid. There are five case studies to verify the proposed maturity model, a case from Indonesian Telecommunication Company and four cases from the study of related IT governance practices. From the case studies result, IT governance practices can provide an understanding related to the utilization of IT roles in an organization. The maturity of business/IT alignment is consistent with the two key dimensions of IT Strategic Grid maturity but it possible to get the lower or higher maturity measurement result comparison with business/IT alignment maturity because of the different weight effectiveness. Details on IT governance practices could help the Board or CIO to take further action to achieve target maturity that accordance with the desired role of IT in the organization.