2. Network Diagram Representations and Network Construction
The network diagram represents the interdependencies and precedence relationships
among the activities of the project. An arrow is commonly used to represent an
activity, with its head indicating the direction of progress in the project. An event
represents a point in time that signifies the completion of some activities and the
beginning of new ones. The following diagram shows an example, where activities (1,
3) and (2, 3) must be completed before activity (3, 4) can start.