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Critical Path

3 replies [Last post]
Mon, 2007-12-10 07:56
Jiayin Yao
User offline. Last seen 13 years 6 weeks ago. Offline
Joined: 23 Mar 2007
Posts: 15
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Hi,

In P5, the critical path was defined as the total float less than or equal to 0.

When filter the critical path, P5 does not pick up all the activities which total float equals 0.
But when I define critical path as total float equals or less than 1. P5 pick up all the activities with 0 float. I think it is something to do with the hours and times. Can anyone tell me how the P5 works?

And also can anyone please explain the longest path, when should I use it?

Thank you very much.
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Replies

Mon, 2007-12-10 12:11
#1
Jiayin Yao
User offline. Last seen 13 years 6 weeks ago. Offline
Joined: 23 Mar 2007
Posts: 15
Groups: None
Hi Ronal and Dieter,

I got it . That is great .

Thank you very much .

Reagrds

Jia yin
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Mon, 2007-12-10 09:38
#2
Ronald Winter
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Joined: 4 Jan 2003
Posts: 928
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Longest Path is a process, similar to but different from CPM and total float. Longest path is a better measurement of the critical path than using total float, as tracking total float ‘fails’ in instances where multiple activity calendars, LOE, interruptible activities, resource leveling, constraints, and out-of-sequence activities are used. I have an article published on the web about this and enhancements to longest path at http://ronwinterconsulting.com/published.htm. Good luck!
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Mon, 2007-12-10 08:11
#3
Dieter Wambach
User offline. Last seen 7 years 3 days ago. Offline
Joined: 15 Jan 2007
Posts: 1350
Groups: Petro-Chem / Oil & Gas, TILOS
Hi Jiayin
The reason is a very simple one:
Primavera does calculate with decimals. If you’ll change your preferences that decimals will be displayed, you’ll realize that those activities you are missing have a float of 0. which is greater than zero.
Edit --> User Preferences --> Time units --> ’Show decimals
Regards
Dieter
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