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TOPIC: Network Diagram

Network Diagram 6 years 4 days ago #1708

  • Jose Romero
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What is the correct formulas used during the foward and backward process ?

I saw that is some sites says:
EF = ES + Duration

But in the PM Prepcast formulas says:

EF = ES + Duration -1

Please help

Jose

Re:Network Diagram 6 years 3 days ago #1709

  • Cornelius Fichtner
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Jose,

I believe that I explain this as part of the lesson of The PM Podcast. Both formulas are correct. But there is a difference in "philosophy" behind them.

* If you follow my formulas (with the '-1'), then you assume that your project begins on "Day 1"
* If you follow the other formulas, then you assume that your project begins on "Day 0"

I prefer my formulas for 2 reasons:

* If your boss tells you that your project begins on the first day of the next month, then he means "January 1" and not "January 0"
* All modern scheduling tools by default start on day 1 and not on day 0 (mainly because they are calendar based)

That's really all there is to it.
Until Next Time,
Cornelius Fichtner, PMP, CSM
President, OSP International LLC

Re:Network Diagram 6 years 1 day ago #1710

  • Jose Romero
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Thank you very much Cornelius.
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