There are a range of options for the calculation of dates and float in a CPM network.
I’ve just finished a draft White Paper focusing on the basic calculations and would appreciate comments on the correctness of the calculations and the methodology adopted. The aim is to produce a definitive document that is generally agreed.
You can download the paper from http://www.mosaicprojects.com.au/PDF/Schedule_Calculations.pdf All comments gratefully appreciated.
Patrick:
Your approach for calculation is not correct, You are missing the basic fundamentals.
Also, your Formula "EST = Preceding EFT + [Lag + 1]" is very general. What if I finished Activity A at 18:00 hrs of Day 2 and I am in a position to start Activity B on same day at 18:30 hrs?
On Page 7 of 17 (BackwardPass Calculation) , I could not understand how did you get the LFT for Activity B as 14 and not 11?
In general,
ForwardPass Calculation:
EFT = EST + DUR - 1
BackwardPass Calculation:
LST = LFT - DUR + 1
Regards,
Puneet Gupta
Bau Management + Consulting GmbH