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Networks- The arrangement of all activities or events in a project arrayed in their logical sequence and represented by arcs and nodes is known as network. It defines the project and the activity precedence relationships. Networks are usually drawn starting on the left and proceeding to the right. Arrowheads placed on the arcs are used to indicate the direction of flow—that is, to show the proper precedence. Before an event can be realized, all activities that immediately precede i.e. predecessors must be completed
The basic approach of all scheduling techniques is to form a network of activity and event relationships that graphically portrays the sequential relations between the tasks in a project. To transform a project plan into a network, one must know what activities comprise then project and, for each activity, what its predecessors (or successors) are. Tasks that must precede or follow other tasks are then clearly identified, in time as well as function. Such a network is a powerful tool for planning and controlling a project.
The most common approach to project scheduling is the use of network techniques such as PERT or CPM. These are in general referred to as “network”. However, if we wish to specify PERT, where the activities are represented as arrows, it is called AOA (activity-on-arrow) and if we refer to CPM, where activities are represented as nodes, it is called AOA (activity-on-node).
Steps to follow to create a network are:- * Begin with the node called “START.” * Draw arrows from the start activity to each of the activities without predecessors. * Add activities one after the other according to the precedence to create the network. * Draw arrows from all the last activities as a precedence for the “END” activity.
AON is typically used in the most popular PC-based commercially available computer software, and AON networks are

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