It is well known that network technique e. g. PERT/CPM has not been diffused in construction site-offices for planning and scheduling. We thought there were two main reasons which were a insufficiency of network method and some difficulty to use computer in site-office. Then in order to improve such drawbacks, we have been tried to renew PERT/CPM, and we have developed a personal computerbased management system called PF-NETS, Planning Forecasting-NETwork System. In this paper, we epitomize our

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... recent results of study. And the purposes of this research project are: (a) to demonstrate the viability of applying this system, (b) to find out some problems, and (c) to show the way to explore them by A. I. techniques. In this process we discovered the new concept which indicate a discrepancy between hierarchical networks. And we named the higher level network "Conceptional Network".