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Project scheduling and control techniques

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Providing basic idea of Activity method, for example AOA and AON

Providing basic idea of Activity method, for example AOA and AON

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  • 1. Project Scheduling and Control Techniques Project Evaluation Planning & ManagementPrepared byS. M. ZUBAER HOSSAIN 1
  • 2. Building the Network: AOA 1 Task Predecessor 1 c 3 a -S a S a b -t t c aa a d br r e b b b d 4t 2 t f c, d 2 g e e 5 Dummy Activity c 1 S a 3 F c t f S 1 3 F a i a i n t r d a n b i d t 4 i s r b 2 g s 2 4 h t e e h 5 2
  • 3. Situations in Network Diagram BA C A must finish before either B or C can start A C both A and B must finish before C can startB A C both A and B must finish before either of C or D can startB D A B A must finish before B can start Dummy C D both A and C must finish before D can start 3
  • 4. Critical path Method (CPM)■ Path - A connected sequence of activities leading from the starting event to the ending event■ Critical Path - The longest path (time); determines the project duration■ Critical Activities - All of the activities that make up the critical path■ Forward Pass - Earliest Start Time (ES) • earliest time an activity can start • ES = maximum EF of immediate predecessors- Earliest finish time (EF) • earliest time an activity can finish • earliest start time plus activity time EF = ES + t 4
  • 5. ■ Backward Pass - Least Start Time (LS) • Least time an activity can start without delaying critical path time - LS = LT – t- Least finish time (LF) • least time an activity can be completed without delaying critical path time • LS = minimum LS of immediate predecessors 5
  • 6. Example : Develop the network (AOA) for a project with following activities and immediate predecessors Activity A B C D E F G H I Immediate Predecessors - - A A A E D,F B,C G,H Completion Time 5 6 4 3 1 4 14 12 6 EST EFT EST=Earliest start time Activity Activity EFT=Earliest finish time name duration LST=Latest start time LFT=Latest finish time LST LFT D[5,8] 2 5 3[7,10] 1 4 7 6 3 6
  • 7. Example : develop the network (AON) for a project with following activities and immediate predecessors Activity a b c d e f g h i j Immediate predecessors - - a a a b, c d d, e f g, h Duration 5 4 3 4 6 4 5 6 6 4 5 9 d4 9 14 7 11 g5 17 21 0 5 5 11 12 17 Solution: j4 E s a5 e6 11 17 17 21EST EFT N t 0 5 5 11 D EST-Earliest start time h6 12 18 EFT-Earliest finish time a 5 8 11 17 LST-Latest start time i6 LFT-Latest finish time r c3 8 12 t 15 21LST LFT 0 4 8 11 f4 b4 11 15 7 11 7
  • 8. Example 5: draw the network for the following relationship:Activity C can be performed at the same time as E; but D cannot be started unlessboth C and A are completed; A and B can be performed simultaneously , B has alsoconstraint on activity C and E , both D and E should be completed before theobject is achieved. C 2 61 7 3 8 81
  • 9. Steps in CPM Project Planning  Specify the individual activities  Determine the sequence of those activities  Draw a network diagram.  Estimate the completion time for each activity.  Identify the critical path (longest path through the network)  Update the CPM diagram as the project progresses.CPM limitations  CPM was developed for complex but fairly routine projects with minimal uncertainty in the project completion times. For less routine projects there is more uncertainty in the completion times, and this uncertainty limits the usefulness of the deterministic CPM model. An alternative to CPM is the PERT project planning model, which allows a 9 82
  • 10. Gantt chartGantt chart: During the era of scientific management, Henry Ganttdeveloped a tool for displaying the progression of a project in theform of a specialized chart. An early application was the tracking ofthe process of ship building projects. Today, Gantt’s scheduling tooltakes the form of a horizontal bar graph and is known as a Ganttchart, a basic sample of which is shown below: Task Duration Jan F Ma Ap Ma Ju Jul Aug Sep Oct Nov Dec e r r y n b 1 2 mo. 2 2 mo. 3 2 mo. 4 2 mo. 5 2 mo. 6 2 mo. Gantt Chart Format 83 10
  • 11. Thank you 11