ABSTRACT
In order to forecast accurate Life Cycle Cost(LCC), various difficult problems should be solved. For example, since there are some areas such as geological conditions that can not be perfectly estimated in advance, while judging only from the initial construction cost, it is a general practice, in many cases, to increase/reduce the construction cost through design change after the contract conclusion. If accurate advance forecasting of even the construction cost only would be difficult while the construction period of building the facilities holds only a very short period of time among the total life cycle, it could be assumed without difficulties that LCC involving the whole life cycle would be affected by more complicated and diversified uncertain factors.
