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How Project Network Diagram's Can Help You Become A Better Project Manager

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This presentation provides a good description of Project Network Diagrams. It explains: Precedence Diagramming Method, Logical Relationships, Lead & Lag, Float and Critical Path Method. It will help you in preparing for PMP Exam.

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How Project Network Diagram's Can Help You Become A Better Project Manager

  1. 1. PROJECT NETWORK DIAGRAM CRITICAL PATH METHOD Designed and Developed by Praveen Malik, PMP 1
  2. 2. Project Schedule Network Diagram Designed and Developed by Praveen Malik, PMP 2  Project Schedule Network Diagrams are simply called Network Diagrams.  Network Diagrams are used to graphically represent logical relationships between project activities (or tasks).  Network Diagrams can be drawn using Precedence Diagramming Method (PDM).
  3. 3. Precedence Diagramming Method(PDM) Designed and Developed by Praveen Malik, PMP 3  PDM uses nodes (boxes) and arrows to represent logical relationship between scheduled activities  Activities are represented as nodes  Milestones are represented as small circles  Dependencies are represented as Arrows  Activities/milestones are separated by Arrows  Arrow head depicts successor activity/milestone  Arrow tail depicts predecessor activity/milestone  Multiple arrows (dependencies) are possible between activities
  4. 4. PDM Example Designed and Developed by Praveen Malik, PMP 4 A B Y Z X • B is the Successor • A is the Predecessor • Start of B depends on Finish of A • Z is the Successor • X & Y are the Predecessors • Start of Z depends on Finish of X&Y
  5. 5. Precedence Diagramming Method(PDM) Designed and Developed by Praveen Malik, PMP 5  PDM is also called Activity on Node (AON) method as activities are represented as nodes (boxes)  PDM includes 4 types of logical relationships  Finish to Start (FS)  Finish to Finish (FF)  Start to Start (SS)  Start to Finish (SF)  Refer to https://www.pmbypm.com/project-network-diagram/ for more details  PDM can be used to represent  Lead or acceleration of the successor activity  Lag or mandatory delay of the successor activity  Refer to https://www.pmbypm.com/project-schedule-leads-and-lags/ for more details
  6. 6. Attributes Of A Project Activity/Task Designed and Developed by Praveen Malik, PMP 6  Activity Name  Duration (D) – Number of time units required to finish an activity  Early Dates  Early Start (ES) – An activity can start as early as this date  Early Finish (EF) – An activity can finish as early as this date  Details in next few slides  Late Dates  Late Start (LS) – An activity can start as late as this date without delaying the project  Late Finish (LF) – An activity can start as late as this date without delaying the project  Details in next few slides  Float/Slack  defined on slide #24  Refer to https://www.pmbypm.com/total-float-vs-free-float/ for more details
  7. 7. Sample Project Designed and Developed by Praveen Malik, PMP 7 Activity Name Duration(Days) Predecessor A 3 Project Start B 4 A C 2 B D 4 B E 5 Project Start F 5 E G 2 E H 5 F, G
  8. 8. Network Diagram for Sample Project Designed and Developed by Praveen Malik, PMP 8
  9. 9. Forward Pass Designed and Developed by Praveen Malik, PMP 9 • Project is assumed to start on Day 0 • Activity A would start along with Project Start – ES of Activity A would be 0 • Activity A would finish after 3 days are elapsed – EF of A would be 3 • EF = ES + D
  10. 10. Forward Pass Designed and Developed by Praveen Malik, PMP 10 • Activity B can start as soon as Activity A finishes • ES of Activity B would be EF of Activity A – ES of successor activity equals EF of predecessor • ESS = EFP
  11. 11. Forward Pass Designed and Developed by Praveen Malik, PMP 11 • Both Activities C & D can start as soon as Activity B finishes • EF = ES + D • ESS = EFP
  12. 12. Forward Pass Designed and Developed by Praveen Malik, PMP 12 • EF = ES + D • ESS = EFP
  13. 13. Forward Pass Designed and Developed by Praveen Malik, PMP 13 • Activity H can start only after both Activities F& G finish • Activity G finishes last so Activity H would start on Day 10 • ESS = Max(EFP)
  14. 14. Project Duration Designed and Developed by Praveen Malik, PMP 14 • Project can finish only after all three Activities C, D & H finish • Activity H finishes last so project duration would be 15 days • Project Duration = Max(EF)
  15. 15. Backward Pass Designed and Developed by Praveen Malik, PMP 15 • Project is assumed to finish on Day 15 • Activities C, D &H can finish as late as Day 15 – LF of these Activities A would be 15
  16. 16. Backward Pass Designed and Developed by Praveen Malik, PMP 16 • Activity C can start as late as Day 13 since it has a Duration of 2 days and it is supposed to be finished by Day 15 • LS = LF - D
  17. 17. Backward Pass Designed and Developed by Praveen Malik, PMP 17 • Activity B has to finish before Activities C & D can start – LF of Activity B would be Day 11 • LSP = Min(LFS)
  18. 18. Backward Pass Designed and Developed by Praveen Malik, PMP 18 • LS = LF – D • LSP = Min(LFS)
  19. 19. Backward Pass Designed and Developed by Praveen Malik, PMP 19 • LS = LF – D • LSP = Min(LFS)
  20. 20. What is Float or Slack? Designed and Developed by Praveen Malik, PMP 20  Total Float is defined as the amount of time that a schedule activity may be delayed from its Early Start date without delaying the project finish date  Can be calculated from the network diagram after completing the backward pass  Indicates the amount of flexibility the project manager has to adjust the timing of a particular activity  Calculated by subtracting Early Finish from Late Finish (or early start from late start)  Float = LF – EF OR Float = LS - ES
  21. 21. Slack/Float Designed and Developed by Praveen Malik, PMP 21
  22. 22. Critical Path Designed and Developed by Praveen Malik, PMP 22  Critical Path is the longest path to complete a project  Any delay on Critical Path can lead to project delay  All the activities on Critical Path are called Critical Activities  Critical Activities have zero Float  Refer to https://www.pmbypm.com/critical-path-method-cpm- project-management/ and https://www.pmbypm.com/critical- path-analysis-example-0-method-1-method/ for more details
  23. 23. Critical Path Designed and Developed by Praveen Malik, PMP 23

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