Network diagram question - no clue!

Submitted by cssk on Tue, 07/01/2014 - 19:23

Here is a question I found on the net in a book http://assets.booklocker.com/pdfs/5866s.pdf

Please let me know what you think what is the correct answer. I thought that ES = EF - Duration.

An activity in a network diagram has Duration of 5 days and Early Finish (EF) of 11 days. What is activity's Early Start (ES)?
(a) 7 days
(b) 4 days
(c) 8 days
(d) 3 days

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PMP Fighter's picture

PMP Fighter

Wed, 07/02/2014 - 03:03

Answer is A

5 work day is necessary.
If the EF is 11th of a month, base on the information, the ES will be 7th day

ES = EF - Duration - 1, assume the Start activity is from day 1 not day 0.

cssk

Wed, 07/02/2014 - 07:39

Does somebody else agree to that reply?

chullan88

Thu, 07/03/2014 - 10:37

Hi cssk,

Think this way
ES = 5
EF = 11

So activity is executed on days 5,6,7,8,9,10,11

Just count it,you'll get the duration.

acurtpmp's picture

acurtpmp

Tue, 07/22/2014 - 19:27

PMP Is right the answer is A. Forward Pass is ES+Duration-1. So with EF of 11, use algebra logic. So for this question its ES - Duration +1, so:

11 +1 = 12 - 5 (Duration) = 7

Sandy10001

Thu, 07/24/2014 - 22:27

The other folks have commented correctly as there are several ways to determine duration and no single definitively correct one. If you find this topic confusing, consider a PMP prep class. I teach for www.PMstudy.com and we definitely cover this information. If you are interested you can contact me at sandra.s@PMstudy.com

ruthkim

Fri, 07/25/2014 - 10:05

Agree that answer is A