Abstract
Precedence Network model that permits 2 kinds of time-lag values as well as 4 kinds of relations has been developed for removing the inconvenience of PERT on representing the precedence relations between activities of a project.This PN/Time model has improved as PN/Manpower model with interactive procedure, which is one of heuristic scheduling models under resource constraints.PN/Manpower model has been extended to PN/Man·Eday model that eliminates the dissatisfaction of PN/Manpower on the assignment of required resources to activities, and also combined with the estimation system for examining the master schedule of a project.All models proposed in this paper have been programmed by BASIC for micro-computer system on construction job-sites.
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