The purpose of this study is to develop a Risk Management System (RMS) for Advisability and Installation Information System (AIIS) project. The developed RMS helps to generate risk information for preventing occurrence of unintended consequences. Risk management for AIIS project process includes (1) Define and scope the AIIS project. (2) Identify internal risks. (3) Explore external risks. (4) Analyze risk factors (5) Set risk management plans. (6) Develop check sheet to monitor risk factors. From the analysis of internal risks, there are 13 risk factors identified. And there are 14 risk factors explored for external risks. All risk factors were rated and evaluated by experts and project managers as well as project operators. Then by means of Fault Tree Analysis (FTA) Technique, plans have been created to control project risks by applying 4 out of 14 plans. For external risk factors, forms for suggestion were used. By illustration from applying the 4 plans, the risk factors which is originally scored to belevel 3 can be scaled down to level 1. The final stage is to develop check sheet for monitor risk factors.