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.

Logic?

4 replies [Last post]
Paul Spice
User offline. Last seen 3 years 50 weeks ago. Offline
Joined: 1 Jun 2001
Posts: 8
Is there a way in P3 to have a task scheduled by saying, "Start date of this task is finish-start to when the first two of the following five tasks have been completed?"

This is required for production logic when step two of a process requires two batches of intermediate product from 5 batch plants. The 5 batch plants are independent, so the second process can start when any two are complete.

Replies

Paul Spice
User offline. Last seen 3 years 50 weeks ago. Offline
Joined: 1 Jun 2001
Posts: 8
Dear James,
Thats what Im doing now, physically checking the pred start dates and linking the succs manually to the first two.
I think thats the only way, thanks,
Paul.
Hi Paul,

I seem to remember having asked P3 about this one a while back. They had no real answer that could solve the problem, other than by some means of regular "physical" checking of the network, and by adding a logic link at the appropriate time.

Sorry, its not the answer your looking for.

Regards...James
Paul Spice
User offline. Last seen 3 years 50 weeks ago. Offline
Joined: 1 Jun 2001
Posts: 8
Hi Ali,

That is a good idea, but will only work when two activities are 100% complete. How do I link them for forecasting, which means when the first two are scheduled to be completed, the "A" can proceed?

If B,C,D, or E early starts change due to updatiing how can "A" link itself to the first two of them in early start sequence?
Ali Hamouda
User offline. Last seen 4 years 18 weeks ago. Offline
Joined: 3 Feb 2002
Posts: 109
Groups: None
Hi,

As I understand , you have a Conditioned Link.

Suppose activities B,C,D,E,F two of them need to be linked to activity A Just when any two of them has been completed.

To translate the upmentioned statement into Logic fomula:

1-First of all export your program to excel format.the format should have at least the fields"ID,percent progres,Predecessor"

2-in the field of the predecessor you will write for each of the five activities the fomula with if statment"IF %Progress=100 Predecessor=FS".

3-you will need to know how to link Exel files to Primavera.othrewise you will import the file back again to P3 each time you update your progress.