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Calculate the critical pathArrow diagram
CriticalPathMethod
Edina NagyLajos Kiss
Szabolcs Hornyák
Time analysis
Time analysis goals:
- How much time is needed to implement the schedule?
- When can I start and finish the activities at the earliest?
- When can I start and finish the activities at the latest?
Activities
A list of all activities required to complete the project.
The time that each activity will take to completion.
The dependencies between the activities.
Basic rules
• Starting point and terminus• Arrows, circles• Activities time• ES,LS,EF,LF• Dummy
4 activities example
ES, EF, LF, LS
ES - earliest start time
EF- earliest finish time
LF- latest finish time
LS- latest start time
ES, EF, LF, LS Formulas
• Ei = ESij• Ej = EFij = ESij+tij• Li = LSij = LFij-tij• Lj = LFij
The time course analysis
→ TFij – total float, TFij = Lj-Ei-tij = LFij-ESij-tij→ FFij – free float, FFij = Ej-Ei-tij→ IFij – independent float IFij = Ej-Li-tij→ CFij – conditional float CFij = TFij-FFij
The time course analysis
The Forward pass (first phase) gives the turnaround time and the earliest possible occurence of events.
The Backward pass (second phase) gives the latest possible occurrence of events.
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References
Dr. Hajdú Miklós YMMF - Construction organization and management
Dr. Mályusz Levente BME - The CPM network
www.netmba.com/operations/project/cpm/
Thanks…