ABSTRACT
The theory of networks plays an important role in the planning and scheduling of projects primarily because of the ease with which these projects can be modelled in network form. This chapter introduces the different types of network representations. According to the types and parameters of the network's elements and based on the combinations of different logical operations, the following network modes are considered. These are generalized network models (GNM), decision box, decision-CPM model; graphical evaluation and review technique (GERT), venture evaluation and review technique (VERT), generalized alternative activity network (GAAN), and controlled alternative activity network (CAAN). The activity-on-arc (AoA) representation, where each arc describes an activity and each node represents the completion of the activities concerning on it. In the GAAN model the problem is to determine the joint variant optimizing the mean value of the objective function, subject to restricted mean values of several other criteria.
