Terminologies in network diagrams
June 2, 2021
Activity (Task): •An activity is any identifiable job which requires time, manpower, material and other resources to complete. •The arrow in a network diagram represents activity.
Concurrent (parallel) activities: •Which can be performed simultaneously and independently to each other. •In the figure, A and B are concurrent activities.
Event – The result of completing one or more activities
Network – The combination of all activities and events that define a project •Drawn left-to-right •Connections represent predecessors
Path – A series of connected activities
Critical – An activity, event, or path which, if delayed, will delay the completion of the project
Critical Path – The path through the project where, if any activity is delayed, the project is delayed
•There is always a critical path
•There can be more than one critical path
Serial Activities:
Performed one after the other, in succession. In the figure A and B are serial activities.
Activity duration:
An activity’s duration is estimated the time required for its completion.
Time unit may be hours, days, weeks or months.
Activity duration= Work quantity/Production rate
Event (Node):
The beginning or end of the activity is known as event.
It represents specific time and does not consume time manpower, material, and other resources.
Two conventions can be used for developing networks are:
Activity on Node (AON) and Activity on Arrow (AOA)
Dummy Activity:
Which doesn’t consume resources like time, cost, manpower, equipment etc. But is only used to show relationships. It is represented by Dashed Arrow.
Earliest Start time (ES):
It is the earliest possible time an activity or operation can be started. It is equal to the earliest occurrence time of the tail event of that activity. It is represented either EST or simply ESi
Earliest Finish Time (EF):
It is the earliest possible time for completion of an activity without delaying the project completion time.
EF= ES + duration EFj=ESi+tij
Latest Finish Time (LF):
It is the latest time the activity must be completed without delaying project duration.
It is equal to the latest occurrence time of the head event.
Latest Start time (LS):
It is the latest possible time; an activity can be started without delaying the project.
LS= LF – duration LSi=LFj – tij
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Project Planning and Management Study notes for M. plan Sem-II
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