## Reply: Activity Duration Equation + email Cost Estimating

 Name E-mail Your e-mail address will never be displayed on the site. Subject Message [quote="Saad Al Naib" post=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 Task name 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. saad[/quote]

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

Max. showing the last 6 posts - (Last post first)
12 years 5 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.

12 years 5 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