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Critical Path Method Farrokh Alemi, Ph.D.. Course on Project Management Purpose of CPM Finish fast Finish fast Quantify progress Quantify progress Communicate.

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Presentation on theme: "Critical Path Method Farrokh Alemi, Ph.D.. Course on Project Management Purpose of CPM Finish fast Finish fast Quantify progress Quantify progress Communicate."— Presentation transcript:

1 Critical Path Method Farrokh Alemi, Ph.D.

2 Course on Project Management Purpose of CPM Finish fast Finish fast Quantify progress Quantify progress Communicate effectively Communicate effectively

3 Course on Project Management Advantages and Disadvantages of Formal Schedules Saves time and money on large complex projects Saves time and money on large complex projects Effective communication tool Effective communication tool Too much work Too much work Assessment of duration of tasks Assessment of duration of tasks Assessment of interdependencies Assessment of interdependencies

4 Course on Project Management Resource Oriented and Time Oriented Schedules Resource oriented Resource oriented Time oriented Time oriented

5 Course on Project Management Elements of a Critical Path Chart Activity Activity Precedence Precedence Duration/cost Duration/cost

6 Course on Project Management Elements of a Critical Path Chart Activity Activity Precedence Precedence Duration/cost Duration/cost ActivityDescription ASelect satisfaction survey tool BPrint survey tool CObtaining list of patients DSample from list EMail surveys to selected patients FCollect responses GAnalyze data

7 Course on Project Management Elements of a Critical Path Chart Activity Activity Precedence Precedence Duration/cost Duration/cost

8 Course on Project Management Elements of a Critical Path Chart Activity Activity Precedence Precedence Duration/cost Duration/cost ActivityDescriptionPrecedents ASelect satisfaction survey tool BPrint survey toolA CSelect list of patients DSample from listC EMail surveys to selected patientsD FCollect responsesE GAnalyze dataF

9 Course on Project Management Elements of a Critical Path Chart Activity Activity Precedence Precedence Duration/cost Duration/cost

10 Course on Project Management Elements of a Critical Path Chart Activity Activity Precedence Precedence Duration/cost Duration/cost ActivityDescriptionPrecedentsDuration ASelect satisfaction survey tool2 weeks BPrint survey toolA3 weeks CSelect list of patients1 week DSample from listC1 week EMail surveys to selected patientsD2 weeks FCollect responsesE4 weeks GAnalyze dataF3 weeks

11 Course on Project Management Branch and Node Charts Activity on branch Activity on branch Activity on node Activity on node

12 Course on Project Management Activity In Node A B C ActivityDescriptionPrecedents ASelect satisfaction survey tool BPrint survey toolA CObtain list of patients DSample from listC EMail surveys to selected patientsD,B FCollect responsesE GAnalyze dataF D E F G

13 Course on Project Management Activity On Branches 1 3 2 ActivityDescriptionPrecedents ASelect satisfaction survey tool BPrint survey toolA CObtain list of patients DSample from listC EMail surveys to selected patientsD,B FCollect responsesE GAnalyze dataF 4 567 ABEF CD End G Start

14 Course on Project Management Earliest and Latest Start and Finish Times A B CD E F G 23243 11 End Start ActivityDescription ASelect satisfaction survey tool BPrint survey tool CSelect list of patients DSample from list EMail surveys to patients FCollect responses GAnalyze data

15 Course on Project Management Earliest and Latest Start and Finish Times A B CD E F G 23243 11 End Start Forward pass calculates early start and finish ActivityDescription ASelect satisfaction survey tool BPrint survey tool CSelect list of patients DSample from list EMail surveys to patients FCollect responses GAnalyze data

16 Course on Project Management Earliest and Latest Start and Finish Times A B CD E F G 23243 11 End Start Backward pass calculates latest start and end times ActivityDescription ASelect satisfaction survey tool BPrint survey tool CSelect list of patients DSample from list EMail surveys to patients FCollect responses GAnalyze data

17 Course on Project Management Earliest and Latest Start and Finish Times A B CD E F G 23243 11 End Start Critical Path includes activities where earliest start time and latest start time are equal ActivityDescription ASelect satisfaction survey tool BPrint survey tool CSelect list of patients DSample from list EMail surveys to patients FCollect responses GAnalyze data

18 Course on Project Management Earliest and Latest Start and Finish Times A B CD E F G 23243 11 End Start Activities not on the critical path have “slack.” The latest start time and the earliest start date are different ActivityDescription ASelect satisfaction survey tool BPrint survey tool CSelect list of patients DSample from list EMail surveys to patients FCollect responses GAnalyze data

19 Course on Project Management Earliest and Latest Start and Finish Times A B CD E F G 23243 11 End Start Finish Early0 Late ActivityDescription ASelect satisfaction survey tool BPrint survey tool CSelect list of patients DSample from list EMail surveys to patients FCollect responses GAnalyze data

20 Course on Project Management Earliest and Latest Start and Finish Times A B CD E F G 23243 11 End Start Finish Early02 Late ActivityDescription ASelect satisfaction survey tool BPrint survey tool CSelect list of patients DSample from list EMail surveys to patients FCollect responses GAnalyze data

21 Course on Project Management Earliest and Latest Start and Finish Times A B CD E F G ActivityDescription ASelect satisfaction survey tool BPrint survey tool CSelect list of patients DSample from list EMail surveys to patients FCollect responses GAnalyze data 23243 11 End Start Finish Early25 Late SF E02 L

22 Course on Project Management ActivityDescription ASelect satisfaction survey tool BPrint survey tool CSelect list of patients DSample from list EMail surveys to patients FCollect responses GAnalyze data Earliest and Latest Start and Finish Times A B CD E F G 23243 11 End Start Finish Early25 Late SF E02 L SF E25 L

23 Course on Project Management ActivityDescription ASelect satisfaction survey tool BPrint survey tool CSelect list of patients DSample from list EMail surveys to patients FCollect responses GAnalyze data Earliest and Latest Start and Finish Times A B CD E F G 23243 11 End Start Finish Early12 Late SF E02 L SF E25 L SF E01 L

24 Course on Project Management ActivityDescription ASelect satisfaction survey tool BPrint survey tool CSelect list of patients DSample from list EMail surveys to patients FCollect responses GAnalyze data Earliest and Latest Start and Finish Times A B CD E F G 23243 11 End Start Finish Early57 Late SF E02 L SF E25 L SF E01 L SF E12 L

25 Course on Project Management ActivityDescription ASelect satisfaction survey tool BPrint survey tool CSelect list of patients DSample from list EMail surveys to patients FCollect responses GAnalyze data Earliest and Latest Start and Finish Times A B CD E F G 23243 11 End Start SF E02 L SF E25 L SF E01 L SF E12 L SF E57 L SF E711 L SF E 14 L

26 Course on Project Management Earliest and Latest Start and Finish Times A B CD E F G 23243 11 End Start SF E02 L SF E25 L SF E01 L SF E12 L SF E57 L SF E711 L SF E 14 L Latest finish is the minimum of latest start of succeeding tasks. Latest start is the latest finish minus duration.

27 Course on Project Management Earliest and Latest Start and Finish Times A B CD E F G 23243 11 End Start SF E02 L SF E25 L SF E01 L SF E12 L SF E57 L SF E711 L SF E 14 L1114 Latest finish is the minimum of latest start of succeeding tasks. Latest start is the latest finish minus duration.

28 Course on Project Management Earliest and Latest Start and Finish Times A B CD E F G 23243 11 End Start SF E02 L SF E25 L SF E01 L SF E12 L SF E57 L SF E711 L7 SF E 14 L1114 ActivityDescription ASelect satisfaction survey tool BPrint survey tool CSelect list of patients DSample from list EMail surveys to patients FCollect responses GAnalyze data

29 Course on Project Management Earliest and Latest Start and Finish Times A B CD E F G 23243 11 End Start SF E02 L02 SF E25 L25 SF E01 L34 SF E12 L45 SF E57 L57 SF E711 L7 SF E 14 L1114 ActivityDescription ASelect satisfaction survey tool BPrint survey tool CSelect list of patients DSample from list EMail surveys to patients FCollect responses GAnalyze data

30 Course on Project Management Slack Time A B CD E F G 23243 11 End Start SF E02 L02 SF E25 L25 SF E01 L34 SF E12 L45 SF E57 L57 SF E711 L7 SF E 14 L1114 Slack time = Latest start – Earliest start

31 Course on Project Management Critical Path A B CD E F G 23243 11 End Start SF E02 L02 SF E25 L25 SF E01 L34 SF E12 L45 SF E57 L57 SF E711 L7 SF E 14 L1114 Critical path includes activities with no slack.

32 Course on Project Management Communicating Project Schedule Time scaled network of activities Time scaled network of activities Gantt chart Gantt chart Time an activity graphs and completion graphs Time an activity graphs and completion graphs

33 Course on Project Management Communicating Project Schedule Time scaled network of activities Time scaled network of activities Gantt chart Gantt chart Time an activity graphs and completion graphs Time an activity graphs and completion graphs

34 Course on Project Management Communicating Project Schedule Time scaled network of activities Time scaled network of activities Gantt chart Gantt chart Time an activity graphs and completion graphs Time an activity graphs and completion graphs

35 Course on Project Management Activity Splitting A B C ActivityDescriptionPrecedents ASelect satisfaction survey tool BPrint survey toolA CObtain list of patients DSample from listC EMail surveys to selected patientsD,B FCollect responsesE GAnalyze dataF D E F G

36 Course on Project Management Activity Splitting A B C ActivityDescriptionPrecedents ASelect satisfaction survey tool BPrint survey toolA CObtain list of patients DSample from listC EMail surveys to selected patientsD,B FCollect responsesE GAnalyze dataF D E F G

37 Course on Project Management Activity Splitting A B C ActivityDescriptionPrecedents ASelect satisfaction survey tool BPrint survey toolA CObtain list of patients DSample from listC EMail surveys to selected patientsD,B FCollect responses (F1=early, F2=Late)E GAnalyze dataF D E F1 G F2

38 Course on Project Management Software Discovery of Critical Path Discovery of Critical Path

39 Course on Project Management Crashing Schedules Cost time tradeoff Cost time tradeoff Order of crashing Order of crashing

40 Take Home Lesson The critical path includes activities with no slack

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