critical path method farrokh alemi, ph.d.. course on project management purpose of cpm finish fast...
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Critical Path MethodCritical Path Method
Farrokh Alemi, Ph.D.Farrokh Alemi, Ph.D.
Course on Project Management
Purpose of CPMPurpose of CPM
Finish fastFinish fast Quantify progressQuantify progress Communicate effectivelyCommunicate effectively
Course on Project Management
Advantages and Disadvantages of Advantages and Disadvantages of Formal Schedules Formal Schedules
Saves time and money on large Saves time and money on large complex projectscomplex projects
Effective communication toolEffective communication tool Too much workToo much work
Assessment of duration of tasksAssessment of duration of tasks Assessment of interdependencies Assessment of interdependencies
Course on Project Management
Resource Oriented and Time Resource Oriented and Time Oriented Schedules Oriented Schedules
Resource orientedResource oriented Time orientedTime oriented
Course on Project Management
Elements of a Critical Path Elements of a Critical Path Chart Chart
ActivityActivity PrecedencePrecedence Duration/costDuration/cost
Course on Project Management
Elements of a Critical Path Elements of a Critical Path Chart Chart
ActivityActivity PrecedencePrecedence Duration/costDuration/cost
Activity Description
A Select satisfaction survey tool
B Print survey tool
C Obtaining list of patients
D Sample from list
E Mail surveys to selected patients
F Collect responses
G Analyze data
Course on Project Management
Elements of a Critical Path Elements of a Critical Path Chart Chart
ActivityActivity PrecedencePrecedence Duration/costDuration/cost
Course on Project Management
Elements of a Critical Path Elements of a Critical Path Chart Chart
ActivityActivity PrecedencePrecedence Duration/costDuration/cost
Activity Description Precedents
A Select satisfaction survey tool
B Print survey tool A
C Select list of patients
D Sample from list C
E Mail surveys to selected patients D
F Collect responses E
G Analyze data F
Course on Project Management
Elements of a Critical Path Elements of a Critical Path Chart Chart
ActivityActivity PrecedencePrecedence Duration/costDuration/cost
Course on Project Management
Elements of a Critical Path Elements of a Critical Path Chart Chart
ActivityActivity PrecedencePrecedence Duration/costDuration/cost
Activity Description Precedents Duration
A Select satisfaction survey tool 2 weeks
B Print survey tool A 3 weeks
C Select list of patients 1 week
D Sample from list C 1 week
E Mail surveys to selected patients D 2 weeks
F Collect responses E 4 weeks
G Analyze data F 3 weeks
Course on Project Management
Branch and Node Charts Branch and Node Charts
Activity on branchActivity on branch Activity on nodeActivity on node
Course on Project Management
Activity In Node Activity In Node
A B
C
Activity Description Precedents
A Select satisfaction survey tool
B Print survey tool A
C Obtain list of patients
D Sample from list C
E Mail surveys to selected patients D,B
F Collect responses E
G Analyze data F
D
E F G
Course on Project Management
Activity On Branches Activity On Branches
1 3
2
Activity Description Precedents
A Select satisfaction survey tool
B Print survey tool A
C Obtain list of patients
D Sample from list C
E Mail surveys to selected patients D,B
F Collect responses E
G Analyze data F
4
5 6 7A B E F
C D
EndG
Start
Course on Project Management
Earliest and Latest Start and Earliest and Latest Start and Finish TimesFinish Times
A B
C D
E F G2 3 2 4 3
1 1
End
Start
Activity Description
A Select satisfaction survey tool
B Print survey tool
C Select list of patients
D Sample from list
E Mail surveys to patients
F Collect responses
G Analyze data
Course on Project Management
Earliest and Latest Start and Earliest and Latest Start and Finish TimesFinish Times
A B
C D
E F G2 3 2 4 3
1 1
End
Start
Forward pass calculates early start and finish
Activity Description
A Select satisfaction survey tool
B Print survey tool
C Select list of patients
D Sample from list
E Mail surveys to patients
F Collect responses
G Analyze data
Course on Project Management
Earliest and Latest Start and Earliest and Latest Start and Finish TimesFinish Times
A B
C D
E F G2 3 2 4 3
1 1
End
Start
Backward pass calculates latest start and end times
Activity Description
A Select satisfaction survey tool
B Print survey tool
C Select list of patients
D Sample from list
E Mail surveys to patients
F Collect responses
G Analyze data
Course on Project Management
Earliest and Latest Start and Earliest and Latest Start and Finish TimesFinish Times
A B
C D
E F G2 3 2 4 3
1 1
End
Start
Critical Path includes activities where earliest start time and latest start time are equal
Activity Description
A Select satisfaction survey tool
B Print survey tool
C Select list of patients
D Sample from list
E Mail surveys to patients
F Collect responses
G Analyze data
Course on Project Management
Earliest and Latest Start and Earliest and Latest Start and Finish TimesFinish Times
A B
C D
E F G2 3 2 4 3
1 1
End
Start
Activities not on the critical path have “slack.” The latest start time and the earliest start date are
different
Activity Description
A Select satisfaction survey tool
B Print survey tool
C Select list of patients
D Sample from list
E Mail surveys to patients
F Collect responses
G Analyze data
Course on Project Management
Earliest and Latest Start and Earliest and Latest Start and Finish TimesFinish Times
A B
C D
E F G2 3 2 4 3
1 1
End
Start
Start Finish
Early 00
Late
Activity Description
A Select satisfaction survey tool
B Print survey tool
C Select list of patients
D Sample from list
E Mail surveys to patients
F Collect responses
G Analyze data
Course on Project Management
Earliest and Latest Start and Earliest and Latest Start and Finish TimesFinish Times
A B
C D
E F G2 3 2 4 3
1 1
End
Start
Start Finish
Early 00 22
Late
Activity Description
A Select satisfaction survey tool
B Print survey tool
C Select list of patients
D Sample from list
E Mail surveys to patients
F Collect responses
G Analyze data
Course on Project Management
Earliest and Latest Start and Earliest and Latest Start and Finish TimesFinish Times
A B
C D
E F G
Activity Description
A Select satisfaction survey tool
B Print survey tool
C Select list of patients
D Sample from list
E Mail surveys to patients
F Collect responses
G Analyze data
2 3 2 4 3
1 1
End
Start
Start Finish
Early 22 55
Late
S F
E 0 2
L
Course on Project Management
Activity Description
A Select satisfaction survey tool
B Print survey tool
C Select list of patients
D Sample from list
E Mail surveys to patients
F Collect responses
G Analyze data
Earliest and Latest Start and Earliest and Latest Start and Finish TimesFinish Times
A B
C D
E F G2 3 2 4 3
1 1
End
Start
Start Finish
Early 22 55
Late
S F
E 0 2
L
S F
E 2 5
L
Course on Project Management
Activity Description
A Select satisfaction survey tool
B Print survey tool
C Select list of patients
D Sample from list
E Mail surveys to patients
F Collect responses
G Analyze data
Earliest and Latest Start and Earliest and Latest Start and Finish TimesFinish Times
A B
C D
E F G2 3 2 4 3
1 1
End
Start
Start Finish
Early 11 22
Late
S F
E 0 2
L
S F
E 2 5
L
S F
E 0 1
L
Course on Project Management
Activity Description
A Select satisfaction survey tool
B Print survey tool
C Select list of patients
D Sample from list
E Mail surveys to patients
F Collect responses
G Analyze data
Earliest and Latest Start and Earliest and Latest Start and Finish TimesFinish Times
A B
C D
E F G2 3 2 4 3
1 1
End
Start
Start Finish
Early 55 77
Late
S F
E 0 2
L
S F
E 2 5
L
S F
E 0 1
L
S F
E 1 2
L
Course on Project Management
Activity Description
A Select satisfaction survey tool
B Print survey tool
C Select list of patients
D Sample from list
E Mail surveys to patients
F Collect responses
G Analyze data
Earliest and Latest Start and Earliest and Latest Start and Finish TimesFinish Times
A B
C D
E F G2 3 2 4 3
1 1
End
Start
S F
E 0 2
L
S F
E 2 5
L
S F
E 0 1
L
S F
E 1 2
L
S F
E 5 7
L
S F
E 7 11
L
S F
E 11 14
L
Course on Project Management
Earliest and Latest Start and Earliest and Latest Start and Finish TimesFinish Times
A B
C D
E F G2 3 2 4 3
1 1
End
Start
S F
E 0 2
L
S F
E 2 5
L
S F
E 0 1
L
S F
E 1 2
L
S F
E 5 7
L
S F
E 7 11
L
S F
E 11 14
L 14
Latest finish is the minimum of latest start of succeeding tasks. Latest start is the latest finish
minus duration.
Course on Project Management
Earliest and Latest Start and Earliest and Latest Start and Finish TimesFinish Times
A B
C D
E F G2 3 2 4 3
1 1
End
Start
S F
E 0 2
L
S F
E 2 5
L
S F
E 0 1
L
S F
E 1 2
L
S F
E 5 7
L
S F
E 7 11
L
S F
E 11 14
L 11 14
Latest finish is the minimum of latest start of succeeding tasks. Latest start is the latest finish
minus duration.
Course on Project Management
Earliest and Latest Start and Earliest and Latest Start and Finish TimesFinish Times
A B
C D
E F G2 3 2 4 3
1 1
End
Start
S F
E 0 2
L
S F
E 2 5
L
S F
E 0 1
L
S F
E 1 2
L
S F
E 5 7
L
S F
E 7 11
L 7 11
S F
E 11 14
L 11 14
Activity Description
A Select satisfaction survey tool
B Print survey tool
C Select list of patients
D Sample from list
E Mail surveys to patients
F Collect responses
G Analyze data
Course on Project Management
Earliest and Latest Start and Earliest and Latest Start and Finish TimesFinish Times
A B
C D
E F G2 3 2 4 3
1 1
End
Start
S F
E 0 2
L 0 2
S F
E 2 5
L 2 5
S F
E 0 1
L 3 4
S F
E 1 2
L 4 5
S F
E 5 7
L 5 7
S F
E 7 11
L 7 11
S F
E 11 14
L 11 14
Activity Description
A Select satisfaction survey tool
B Print survey tool
C Select list of patients
D Sample from list
E Mail surveys to patients
F Collect responses
G Analyze data
Course on Project Management
Slack TimeSlack Time
A B
C D
E F G2 3 2 4 3
1 1
End
Start
S F
E 0 2
L 0 2
S F
E 2 5
L 2 5
S F
E 0 1
L 3 4
S F
E 1 2
L 4 5
S F
E 5 7
L 5 7
S F
E 7 11
L 7 11
S F
E 11 14
L 11 14
Slack time = Latest start – Earliest start
Course on Project Management
Critical PathCritical Path
A B
C D
E F G2 3 2 4 3
1 1
End
Start
S F
E 0 2
L 0 2
S F
E 2 5
L 2 5
S F
E 0 1
L 3 4
S F
E 1 2
L 4 5
S F
E 5 7
L 5 7
S F
E 7 11
L 7 11
S F
E 11 14
L 11 14
Critical path includes activities with no slack.
Course on Project Management
Communicating Project ScheduleCommunicating Project Schedule
Time scaled network of activitiesTime scaled network of activities Gantt chartGantt chart Time an activity graphs and Time an activity graphs and
completion graphs completion graphs
Course on Project Management
Communicating Project ScheduleCommunicating Project Schedule
Time scaled network of activitiesTime scaled network of activities Gantt chartGantt chart Time an activity graphs and Time an activity graphs and
completion graphs completion graphs
Course on Project Management
Communicating Project ScheduleCommunicating Project Schedule
Time scaled network of activitiesTime scaled network of activities Gantt chartGantt chart Time an activity graphs and Time an activity graphs and
completion graphs completion graphs
Course on Project Management
Activity Splitting Activity Splitting
A B
C
Activity Description Precedents
A Select satisfaction survey tool
B Print survey tool A
C Obtain list of patients
D Sample from list C
E Mail surveys to selected patients D,B
F Collect responses E
G Analyze data F
D
E F G
Course on Project Management
Activity Splitting Activity Splitting
A B
C
Activity Description Precedents
A Select satisfaction survey tool
B Print survey tool A
C Obtain list of patients
D Sample from list C
E Mail surveys to selected patients D,B
F Collect responses E
G Analyze data F
D
E F G
Course on Project Management
Activity Splitting Activity Splitting
A B
C
Activity Description Precedents
A Select satisfaction survey tool
B Print survey tool A
C Obtain list of patients
D Sample from list C
E Mail surveys to selected patients D,B
F Collect responses (F1=early, F2=Late) E
G Analyze data F
D
E F1 G
F2
Course on Project Management
Software Software
Discovery of Critical PathDiscovery of Critical Path
Course on Project Management
Crashing Schedules Crashing Schedules
Cost time tradeoffCost time tradeoff Order of crashingOrder of crashing
Take Home LessonTake Home Lesson
The critical path includes activities The critical path includes activities with no slackwith no slack