Abstract
High risk is usually included in Information systems project to achieve high performances of manufacturing systems. In the early stage ofthe projects, good feasibility study (FS) is important in order to reduce Lhe risk. Therefore, we discuss what process is needed for implementing the FS. TOC (Theory Of Constraint), BSC (Balanced Score Card), CMM (Capability Maturity Model) are effective methods to innovate and describe the FS process. In the discussion, we show that a vision free from current constraints is important, and that TOC thinking process is effective to find, analysis and solve the problems.