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Lag???

4 replies [Last post]
Fri, 2007-02-09 01:13
Ritesh Kumar
User offline. Last seen 1 year 43 weeks ago. Offline
Joined: 9 Apr 2006
Posts: 49
Groups: Petro-Chem / Oil & Gas
Dear all


Lag in activities schedule stand what???
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Replies

Wed, 2007-02-28 22:36
#1
Rodel Marasigan
User offline. Last seen 1 hour 56 min ago. Offline
Joined: 25 Oct 2006
Posts: 1699
Groups: Petro-Chem / Oil & Gas
Hi Marcio,

No offence please, I just want to correct your comment regarding the relationship lag calendar.

Not all software calculate there relationship lag base on successor. P3 interprets lag times according to the predecessor activity’s base calendar. Consider two activities that have a start to start relationship with a 2-day lag. If the predecessor activity uses a 7- day workweek and finishes on a Friday, P3 schedules the 2-day lag on Saturday and Sunday (workdays for the predecessor), even if those days are nonworkdays for the successor; P3 then schedules
the successor activity to start on Monday. On P3e/ Project Management 4.1 or 5 there is an option where you can select where to base your relationship lag (predecessor, successor, 24 hrs or project default calendar) before scheduling. Same as P3 MSP98, 2000 & 2002 also using predecessor’s calendar while MSP2003 onwards calculate relationship lag based on successor. I have this problem before where I manage to resolve MS Project issue by installing the MSP service pack 1 for MSP2002.

I also highly recommend that kindly refer to software manual before posting your comment or it may leads other PP on the wrong directions.

Regards,
Rodel
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Wed, 2007-02-28 14:20
#2
Marcio Sampaio
User offline. Last seen 11 years 34 weeks ago. Offline
Joined: 7 Nov 2005
Posts: 658
Groups: Petro-Chem / Oil & Gas
Lag

An offset or delay from an activity to its successor. Lag can be positive or negative and it is based on the calendar of the successor activity.


Regards.
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Fri, 2007-02-09 03:56
#3
Ritesh Kumar
User offline. Last seen 1 year 43 weeks ago. Offline
Joined: 9 Apr 2006
Posts: 49
Groups: Petro-Chem / Oil & Gas
Mr Brennan Westworth

Thanks for everything.

regards
Ritesh Kumar
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Fri, 2007-02-09 01:24
#4
Brennan Westworth
User offline. Last seen 6 years 51 weeks ago. Offline
Joined: 23 Feb 2003
Posts: 150
Groups: None
Lag is a duration attached to a relationship.

eg:

you are installing a simple underground pipe run

your activities are:

Excavate Trench
Lay Pipe
Backfill

the logic is that you need to excavate the trench then lay the pipe then backfill.

But you dont need the whole excavation complete before you start to lay the pipe and you dont need all the pipe in before you start backfilling.

it also follows that you need the excavation complete before you can finish laying the pipe, and you need the pipe laid before you can complete backfill.

therefore your activities would be linked SS and FF with lags.


these are your lags:
- how long do you need to excavate before you can start to lay the pipe?
- how long after you start laying pipe can you start backfilling?
- how long after your excavation is complete could you complete the piping?
- how long after your piping is complete could you complete backfilling?

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