Abstract
The purpose of this study is to propose Strategic Information Technology (IT) Portfolio Management System supporting IT investment for achieving a firm's competitive advantage. IT portfolio research has been conducted in terms of four research perspectives. This study focues on IT investment portfolio model research. Four categories of IT (Function IT, Network IT, Offensive Enterprise IT, and Defensive Enterprise IT) are proposed. These four categories make up the IT investment portfolio model. The four IT categories are fundamentally different in the light of business-IT alignment. The IT investment portfolio model is a foundation for evaluating and comparing IT investment projects. IT project portfolio model is developled based on the IT investment portfolio model.
