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CPM P3         PRECEDENCE     DIAGRAMMING METHOD            (PDM)
CPM P3             What is PDM?   • An extension of the traditional AON   • Network model with additional     relationship...
CPM P3              Introduction   • Between 20-30% of contracting     organisation in Europe are using     Precedence Dia...
CPM P3                continued   • Availability of lag has made this     technique more adaptable to the     planner’s ne...
CPM P3         Precedence Diagram’s               Notation   •   Earliest start time (ES)   •   Earliest finish time (EF) ...
CPM P3             Advantages &             Disadvantages   • Fewer activities       • Complicates manual   • No restraint...
CPM P3     Precedence Relationship   • Four types of precedence relationship     which includes:         –   Finish to Sta...
CPM P3             Finish to Start     Activity A has to finish completely before     Activity B can start                ...
CPM P3              Start to Start   Activity B has to start together with Activity A                        SS           ...
CPM P3            Finish to Finish   Activity B must finish together with Activity A                          FF          ...
CPM P3             Start to Finish   Activity B finish as soon as Activity A starts                         SF            ...
CPM P3
CPM P3                Lead and Lag   • Lead is the time that    • Lag is the time that     an activity precedes       an a...
CPM P3                      200        250                   F&R #1-7   F&R #8-21                    4 days      8 days   ...
CPM P3                300                400                       FS 5             Casting             Set Col.          ...
CPM P3              Driving Relationship   • Forward Pass:         – One that results in latest EF time for           succ...
CPM P3         0    100         6 FF 4                                                PDM         Excavation              ...
CPM P3            100          FF 4               PDM         Excavation                                          Backward...
CPM P3         0   100       6 FF 4                                           PDM Total         Excavation                ...
CPM P3         0   100       6 FF 4                                               PDM         Excavation                  ...
ACTIVITY   DURATION   PREDECESSOR START        0             -   A          7          START   B          5          START...
SS+3                    C                   11d        A                ACTIVITY   DURATIO PREDECE                        ...
SS+3                     C              H                    11d             8d         A          FS -1                  ...
I      4      F,        SS+3                                FF-2              H(FF-2)                                     ...
SS+3                                FF-2                    C                H                    7d               8d     ...
FORWARD PASS OPERATION                     SS+3         3        14                          22    FF-2                   ...
BACKWARD PASS                      SS+3             3           14               14             22 FF-2                   ...
IDENTIFY CP                      SS+3       3 6 14                  14 6 22 FF-2                                   C      ...
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Precedence Diagramming Method PDM

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Precedence Diagramming Method PDM

  1. 1. CPM P3 PRECEDENCE DIAGRAMMING METHOD (PDM)
  2. 2. CPM P3 What is PDM? • An extension of the traditional AON • Network model with additional relationships • Introduced in 1964 • More flexible than AON; allow overlaps • Available on almost all commercial microcomputer-based PMS
  3. 3. CPM P3 Introduction • Between 20-30% of contracting organisation in Europe are using Precedence Diagram • This technique is more versatile as compared to other network planning • Determination of ES, EF, LS and LF is similar to that of CPM except one has to take lag into consideration
  4. 4. CPM P3 continued • Availability of lag has made this technique more adaptable to the planner’s needs • this tool can guide the managers in making critical decisions such as to deploy resources based on priority • can assist the client in determining the duration for extension of time
  5. 5. CPM P3 Precedence Diagram’s Notation • Earliest start time (ES) • Earliest finish time (EF) • Latest start time (LS) • Latest finish time (LF) • Duration (D) • Total float (TF)
  6. 6. CPM P3 Advantages & Disadvantages • Fewer activities • Complicates manual • No restraints calculations • Quicker & easier • May produce logic different dates on • Better represents different software the actual work flow • Updating & managing change can be challenging
  7. 7. CPM P3 Precedence Relationship • Four types of precedence relationship which includes: – Finish to Start (FS) – Start to Start (SS) – Finish to Finish (FF) – Start To Finish (SF)
  8. 8. CPM P3 Finish to Start Activity A has to finish completely before Activity B can start FS A B
  9. 9. CPM P3 Start to Start Activity B has to start together with Activity A SS A B
  10. 10. CPM P3 Finish to Finish Activity B must finish together with Activity A FF A B
  11. 11. CPM P3 Start to Finish Activity B finish as soon as Activity A starts SF A B
  12. 12. CPM P3
  13. 13. CPM P3 Lead and Lag • Lead is the time that • Lag is the time that an activity precedes an activity follows or the start or finish of is delayed from the its successor start or finish of its predecessor
  14. 14. CPM P3 200 250 F&R #1-7 F&R #8-21 4 days 8 days 200 FF 2 300 350 Form&Rebar Cast #1-7 Cast #8-21 12 days 4 days 2 days 300 Casting PDM vs. SS 4 6 days AON
  15. 15. CPM P3 300 400 FS 5 Casting Set Col. PDM 6 days 9 days vs. AON 300 350 400 Casting Curing Set Col. 6 days 5 days 9 days
  16. 16. CPM P3 Driving Relationship • Forward Pass: – One that results in latest EF time for successor • Backward Pass: – One that results in the earliest LS for the predecessor
  17. 17. CPM P3 0 100 6 FF 4 PDM Excavation Forward 6 days Pass 2 200 14 FF 2 Form&Rebar SS 2 12 days 10 300 16 21 400 30 FS 5 Casting Set Col. SS 4 6 days 9 days
  18. 18. CPM P3 100 FF 4 PDM Excavation Backward 0 6 days 6 Pass 200 FF 2 Form&Rebar SS 2 2 12 days 14 300 400 FS 5 Casting Set Col. SS 4 10 6 days 16 21 9 days 30
  19. 19. CPM P3 0 100 6 FF 4 PDM Total Excavation Float 0 6 days 6 TF=0 2 200 14 FF 2 Form&Rebar SS 2 2 12 days 14 TF=0 10 300 16 21 400 30 FS 5 Casting Set Col. SS 4 10 6 days 16 21 9 days 30 TF=0 TF=0
  20. 20. CPM P3 0 100 6 FF 4 PDM Excavation The 0 6 days 6 Critical TF=0 2 200 14 FF 2 Path Form&Rebar SS 2 2 12 days 14 TF=0 10 300 16 21 400 30 FS 5 Casting Set Col. SS 4 10 6 days 16 21 9 days 30 TF=0 TF=0
  21. 21. ACTIVITY DURATION PREDECESSOR START 0 - A 7 START B 5 START C 11 A(SS+3) D 10 START E 9 B F 5 A(FS-1) G 8 A, D H 8 C I 4 F, H(FF-2) J 12 E(FS+2), G(FF+3) K 3 E FINISH 0 I, J, K
  22. 22. SS+3 C 11d A ACTIVITY DURATIO PREDECE N SSOR 7d START 0 - A 7 STARTSTAR D B 5 START T 10d C 11 A(SS+3) 0d D 10 START B 5d
  23. 23. SS+3 C H 11d 8d A FS -1 F 7d 5dSTART D G 0d 10d 8d E 9 B F 5 A(FS-1) G 8 A, D B E 7d 9d H 8 C
  24. 24. I 4 F, SS+3 FF-2 H(FF-2) C H J 12 E(FS+2) 7d 8d G(FF+3) K 3 EFINISH 0 I, J, K A FS -1 I F 7d 4d 5d FF+3 START D G 0d 10d 8d J FINISH 12d 0d FS+2 B E K 7d 9d 3d
  25. 25. SS+3 FF-2 C H 7d 8d A FS -1 I F 7d 4d 5d FF+3START D G 0d 10d 8d J FINISH 12d 0d FS+2 B E K 7d 9d 3d
  26. 26. FORWARD PASS OPERATION SS+3 3 14 22 FF-2 14 C H 11d 8d 0 7 6 11 16 20 A FS -1 I F 7d 4d 5d0 0 0 10 18 FF+3 10 START D G 16 28 28 28 0d 10d 8d J FINISH 12d 0d FS+2 0 5 5 14 14 17 B E K 5d 9d 3d
  27. 27. BACKWARD PASS SS+3 3 14 14 22 FF-2 C H 11d 8d 20 28 9 20 0 7 16 20 6 11 A FS -1 I F 7d 4d 5d 6 13 19 24 24 280 0 0 10 18 FF+3 10 STA D G 16 28 28 28 RT 10d 8d J FINISH0 0d 0 7 17 17 25 12d 0d 16 28 28 28 FS+2 0 5 5 14 14 17 B E K 5d 9d 3d 0 5 5 14 25 28
  28. 28. IDENTIFY CP SS+3 3 6 14 14 6 22 FF-2 C H * 11d 8d •* 9 20 20 28 0 6 16 8 20 7 6 13 11 A FS -1 I F 7d 4d 5d 6 13 19 24 24 280 0 0 0 7 10 FF+3 10 7 18 STA D G 16 0 28 28 0 28 RT 10d 8d J FINISH0 0d 0 7 17 17 25 12d 0d 16 28 28 28 FS+2 0 0 5 5 0 14 14 11 17 B E K 5d 9d 3d 0 5 5 14 25 28

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