Guild of Project Controls: Compendium | Roles | Assessment | Certifications | Membership

Tips on using this forum..

(1) Explain your problem, don't simply post "This isn't working". What were you doing when you faced the problem? What have you tried to resolve - did you look for a solution using "Search" ? Has it happened just once or several times?

(2) It's also good to get feedback when a solution is found, return to the original post to explain how it was resolved so that more people can also use the results.

Why P3 Calculate backwards?

6 replies [Last post]
Tue, 2010-07-27 04:52
Angel Cruz
User offline. Last seen 11 years 3 weeks ago. Offline
Joined: 16 May 2010
Posts: 16
Groups: Petro-Chem / Oil & Gas, Pinoy Planning Planet Community
I encounter some difficulties on my P3 Schedule. P3 calculates backward in some of my the activities. On my Project Overview : Project start on 08FEB10 and Project must finish on 17AUG13.

For example I have an activity having duration of 10 days without any predecessor and succesor. So, P3 usually gives ES 08FEB10 EF 17FEB10, but on my file P3 gives ES 08AUG13 EF 17AUG13.

Is there any problems with my setting?
Why P3 calculate backwards?
How to correct this kind of activities?

Tnx.


Angel

Top

Replies

Thu, 2010-07-29 04:54
#1
Angel Cruz
User offline. Last seen 11 years 3 weeks ago. Offline
Joined: 16 May 2010
Posts: 16
Groups: Petro-Chem / Oil & Gas, Pinoy Planning Planet Community
Yup your correct, there is Float Constraint-Zero Free Float..ALAP

Tnx.
Top
Wed, 2010-07-28 23:20
#2
Rodel Marasigan
User offline. Last seen 22 hours 4 min ago. Offline
Joined: 25 Oct 2006
Posts: 1699
Groups: Petro-Chem / Oil & Gas
Angel,
Can you check if it has Float constrain. Zero free float have that attitude same as As Late as Possible.
Top
Wed, 2010-07-28 22:41
#3
vex zex
User offline. Last seen 13 years 25 weeks ago. Offline
Joined: 7 Jul 2010
Posts: 42
Groups: GPC Malaysia, Petro-Chem / Oil & Gas
hi shahul,

just set the start date at project overview,
Then schedule..level...
U can get what u want
Top
Wed, 2010-07-28 20:47
#4
Angel Cruz
User offline. Last seen 11 years 3 weeks ago. Offline
Joined: 16 May 2010
Posts: 16
Groups: Petro-Chem / Oil & Gas, Pinoy Planning Planet Community
Hi Shahul,

But the activity having no succesor, predecessor and constraint.

Could you please direct me to the similar topic you’ve said. I search the forum but didn’t find it.


Tnx in Advance.
Top
Wed, 2010-07-28 09:32
#5
Shah. HB
User offline. Last seen 19 weeks 3 hours ago. Offline
Joined: 25 Nov 2008
Posts: 773
Groups: GPC Malaysia, GPC Qatar, Planning, Claims & Contracting, TILOS
Hi Cruz

It is due to the constraints which shows finish date earlier than start date

I have experianced the same and even the similar topic have been discussed in this forum.You could refer for your reference
Top
Tue, 2010-07-27 05:15
#6
Vladimir Liberzon
User offline. Last seen 17 weeks 1 day ago. Offline
Joined: 5 Feb 2001
Posts: 2748
Groups: Accreditation Editors, Board of Advisors, Civil Engineering, GPCCAR Editors, Petro-Chem / Oil & Gas, Regional Representatives, Spider Project Team, TURNAROUND & SHUTDOWN (T/A & S/D)
Activity may be of ALAP (As Late As Possible) type.
And the schedule may be calculated backward - check scheuling settings.
Top