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In order to investigate disaster restoration and system performance recovery of lifelines, a model is required which can forecast quantitatively time sequential changes in the restoration process. For this purpose, a functional evaluation model which treats the mechanism of disaster's influence, was described, and then a quantitative and realistic functional evaluation model which takes into consideration inter-chain between lifelines was derived. Utilizing a method of system dynamics (S.D.), the whole functional evaluation of electric power and water supply systems which play the most important role in lifeline systems was investigated. ƒL�[ƒ��[ƒh�i‰p�j�F - ‹LŽ–‹æ•ª�F - ‹æ•ª �@�@�@�@˜_•¶�W