This document discusses the process of updating a project network diagram based on actual project progress and changes. It provides definitions and explanations of updating, describes the data and steps required for the updating process, and gives an illustrative example of updating the network for a project after 12 days where some activities finished earlier than planned while others were delayed. The example network is updated by assigning completion times, remaining durations and revised estimates based on new information, and recalculating the critical path.

1. Mr. Ramesh Nayaka, (M.Tech. –IIT Madras)
Assistant Professor
Department of Civil Engineering
Manipal Institute of Technology, Manipal -576104
Karnataka, India
Chapter –8
UPDATING
Course Code -CIE 403

2. Content…
Introduction
Updating: Process
Data Required for Updating
Steps in the Process of Updating
Illustrative Examples on Updating

3. Introduction
Updating:Basedontheprogressoftheworkandthereviseddurationofunfinishedactivitiesduetodelays,thenetworkdiagramhastoberedrawnandthisprocessisknownasupdating.
Controllingiscomplementarytotheplanning
Controlovertheprogressofworkhastobeexercisedinordertocompletetheworkbythestipulateddate
Controlinvolvescomparingatregularintervals,theactualachievementwiththeoriginalplansandthentakinganynecessarycorrectiveactiontobringthingsbackonschedule
itrequiresupwardflowofinformationthroughasuitablydesignedreportingsystem
Theinformationsofedisanalysedandtheprojectplanisbroughtuptodatewithnecessaryvariationstokeepperformanceaspertheschedule

4. Updating: Process
•UpdatingProcess:Theprocessofreplanningandreschedulingbasedontheresultswhichserveaguidancefordecisionbyperformingcalculationsmadebytakingintoconsiderationthenewknowledgeandlatestinformationatanintermediatestageoftheprojectthusmodifyingtheoriginalnetwork,isknownastheprocessofUpdating.
•Processofimplementingtheplanaccordingtothenetwork,wemaycomeacrossthefollowingpossibilities
1.thatsomeorallactivitiesareprogressingaccordingtoschedule
2.Thatsomeorallactivitiesareaheadofschedule;and
3.Thatsomeorallactivitiesarebehindschedule

5. Data Required for Updating
•Following information is necessary to update the plan at an intermediate stage of execution of a project:
1.Original network
2.Original network calculation chart
3.Stage at which updating is being done i.e., a point in time of updating
4.Execution position of the project at that stage and
5.New information and knowledge which will affect the duration time of the activities to be performed

6. Steps in the Process of Updating
•Describe
The point in time at which updating is to be done according to the original plan
•Record
What has happened actually till the updating point.
•Summarise
The knowledge attained in the tabulated form as given below

7. Cont’d…

8. Steps in the Process of Updating
•Place
the information contained in the updating table on to the original network this is done by:
1.Assigning the time of update as the earliest occurrence time for the tail event of the project
2.Allotting a zero time duration for all activities which have been completed
3.Entering the remaining estimated durations of those activities which are in progress
4.Entering the estimated durations based on new knowledge of activities which are still to be commenced
Perform
Calculations of earliest occurrence time and latest allowable time and mark these on the network known as updated network .

9. Updating Cycle
Replan Reschedule project
network
Compare progress to schedule is if satisfactory
Issue
Directions
Report
progress
Execute the
Project
Record and
Assess progress
Project Completed
No
Yes

10. When to update ??
1.For shorter duration projects, the updating must be done frequently by taking into account the latest position of the execution of the project
2.For larger duration projects, the process of updating must be increased as the project is progressing towards completion. Duration of project goes on decreasing as project progresses, and behaving more or less like a small duration project
3.Whenever there is major change in the duration of any of the activity the updating is to be done
4.Updating is essential if there is change in the estimated duration of Any activity falling on the critical path. If the duration of a critical activity increases, remedial measures are necessary and if the activity duration decreases, this may allow changes in the project plan which were not possible previously.

11. Illustrative Examples on Updating
Figure shows the network of a project which is to be updated at the end of 12 days.
The following conditions exists at the time of updating:
1.Activity 1 –4 was completed as originally planned.
2.Activity 1 –3 was executed more rapidly then originally scheduled, and it took 8 days for its completion.

12. Illustrative Examples on Updating
3. Activity 3 –4 commenced following the completion of activity 1 –3 and was completed at the end of 11thday
4. Activity 4 –5 was commenced following the completion of activity 3 –4 (i.e., at the end of 11thday), and still requires 6 more days for its completion .
5. Completion of activity 1 –2 was delayed drastically. And it still requires 10 more days for its completion.
6. Activity 2 –7 will commence following the completion of activity 1 –2
And will require 9 days for its completion instead of 6 days originally estimated.
7. The time required to perform activity 5 –8 has been revised, based on the experience on the project, gained to this point. It now requires 10 days in the place of 6 days originally estimated.
8. No other activities have been started, and the original time estimates for these activities still appear to be accurate.
Update the network, and determine the revised critical path.

13. Cont’d…