Successfully reported this slideshow.
Upcoming SlideShare
×

# Precedence Diagramming Method PDM

39,090 views

Published on

• Full Name
Comment goes here.

Are you sure you want to Yes No
• thank you for the nice presentation

Are you sure you want to  Yes  No
• @Alaa Hamine Yes, it is 30.

Are you sure you want to  Yes  No
• Limited by project late finish = 28

Are you sure you want to  Yes  No
• the late finish of H should be 30, no?

Are you sure you want to  Yes  No
• Pusing Juga...

Are you sure you want to  Yes  No

### 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