Rules for Drawing Network Diagram
Network Diagram Representation
Network Diagram Representation In a network representation of a project few definitions are used 1. Action Any individual operation which makes use of resources and has an finish and a starting is chosen every bit activity. An arrow is generally used to narrate an action with its head representing the direction of progress in the project. These are divided into four classes The dummy activity is included in the network to clear the activity pattern in the next two situations For instance, take a situation where A and B are concurrent activities. C is reliant on A and D is reliant on A and B both. This type of situation can exist handled with the use of dummy action every bit shown in the effigy. ii. Issue An event signifies a point in time representing the completion of several activities and the starting of new ones. This is typically symbolizes by a circle in a network which is as well known as node or connector. The events are divided into three categories 3. Sequencing The kickoff requirement in the development of network is to keep the precedence relationships. In order to prepare a network, the subsequent points must exist taken into considerations As all further calculations are on the basis of network, it is essential that a network exist drawn with total care. Rules for Drawing Network Diagram Rule 1 Each of the activity is symbolized by one and merely one arrow in the network Rule 2 No 2 activities can be recognized by the same cease events Rule 3 To clinch the correct precedence relationship in the pointer diagram, various questions must exist tested every time any activity is added to the network In example of large network, it is necessary that certain proficient habits exist applied to draw an like shooting fish in a barrel to follow network Common Errors in Drawing Networks The three types of errors are most oft seen in drawing network diagrams 1. Dangling To cut off an activity prior to the completion of all activities in a network diagram is referred to every bit dangling. As reveal in the figure activities (5 - 10) and (6 - vii) are not the final activities in the network. And so the diagram is incorrect and shows the error of dangling ii. Looping or Cycling Looping error is also called as cycling error in a network diagram. Making an endless loop in a network is called equally error of looping as revealed in the following figure. iii. Redundancy Needlessly put the dummy action in network logic is called as the error of redundancy as reveal in the diagram beneath Advantages and Disadvantages PERT/CPM has the subsequent advantages PERT/CPM has the subsequent disadvantages:
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