Lag???

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?

Mr Brennan Westworth

Thanks for everything.

regards
Ritesh Kumar

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.

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