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## Topic History of: Activity Duration Equation + email Cost Estimating

Max. showing the last 6 posts - (Last post first)
6 years 7 months ago #2139

Hi,

I have only one questions:

Equations of Network Diagram in specific:

- Activity Duration = EF-ES+1
- Activity Duration = LF-LS+1
- ES = EF of predecessor +1
- LF = LS of successor -1

Ex. Page 90 of PMP Certification Mathematics by Vidya And Riva

9 2 11 15 1 16
D F
19 10 21 21 6 22

ES Dur. EF
LS Slack LF

Why other diagrams in other books like above won't get right answer or am I missing something.

email Budget question before understood.

Thank You.

6 years 7 months ago #2138

Dear Sir,

I have two questions:

1- Equations of Network Diagram in specific:

- Activity Duration = EF-ES+1
- Activity Duration = LF-LS+1
- ES = EF of predecessor +1
- LF = LS of successor -1

Only you and PMP Headfirst explained that approach.

To understand, I pulled on solved network problem and want to see above true in some books right, others not showing that am talking about +1, -1 of the above equations. Why?

Ex. Page 90 of PMP Certification Mathematics by Vidya And Riva

9 2 11 ES Dur. EF
19 10 21 LS Slack LF

hw.libsyn.com/p/5/a/3/5a3116d9237f4a9d/P...l_eid=&l_mid=1788367

Is this different from your video prepcast and where we find all audio links?

Thank You.

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