© Springer International Publishing Switzerland 2014.The customization of software process capability/maturity models to specific domains/sectors or development methodologies represents one of the most critical challenges of the process improvement domain. As a result of the literature review, it is observed that there is a lack of a guideline for how to improve process quality in governmental institutions. Therefore, in this study, development of a government process capability model based on ISO/IEC 15504 is aimed in order to ensure that processes are consistently applied, managed, and controlled across a governmental institution. Towards this goal, a government business process classification framework consisting of management of government resources and support processes and government specific processes is constructed. As a government specific process; public investment management process is defined and assessed as a case study to explore the applicability of this framework. Initial findings of the study indicate the usefulness and adequacy of the proposed approach.