Guys / Girls !
I am working on a project where the planner is unaware / unsure why I have told him "no negative lag to be in the logic sequence". I am trying to find a document on why negative lag is bad planning practice.
I have been taught never to use minus lag in my programmes. “Forget the option is even there” I was taught.
The reason for this if you have: Activity (A) F/S – 10 with Activity (B) & activity (A) runs over it will push the start of Activity (B) out. As F/S Logic is being used.
If you would have used: Activity (A) S/S + 10 with Activity (B) then Activity (B) would start on the correct date as it is dependent on the start of Activity (A) not the finish of Activity (A).
Please don’t give me any smart arse replies like what if activity (A) was being delayed also !!! Or what about the open end (you should have S/S + F/F) I am trying to keep it simple !!. I know there are other reasons why minus lag should not be used but I would like to get your thoughts on this subject.
Lots of planners / software jockeys in the Middle East which I have come across use this feature a lot. I have seen minus lags of over 100 days. Which in my mind is lazy planning and they have no clue on what the proper sequence of events should be, so they just use minus lag to hold a date. It becomes really hard when assessing claims on their programme, due to critical path analysis etc.
I cannot find anything on Google so I need your thoughts, I will then write them up as this guy can read English really well, just not understand my broad London accent! He is from Korea.
If anyone has any papers on this subject or can point the way I would be really grateful or just post your thoughts here and I will review them and add them to my write up. I have started the paper but thought I would post here incase I missed anything out.
Thanks
I am working on a project where the planner is unaware / unsure why I have told him "no negative lag to be in the logic sequence". I am trying to find a document on why negative lag is bad planning practice.
I have been taught never to use minus lag in my programmes. “Forget the option is even there” I was taught.
The reason for this if you have: Activity (A) F/S – 10 with Activity (B) & activity (A) runs over it will push the start of Activity (B) out. As F/S Logic is being used.
If you would have used: Activity (A) S/S + 10 with Activity (B) then Activity (B) would start on the correct date as it is dependent on the start of Activity (A) not the finish of Activity (A).
Please don’t give me any smart arse replies like what if activity (A) was being delayed also !!! Or what about the open end (you should have S/S + F/F) I am trying to keep it simple !!. I know there are other reasons why minus lag should not be used but I would like to get your thoughts on this subject.
Lots of planners / software jockeys in the Middle East which I have come across use this feature a lot. I have seen minus lags of over 100 days. Which in my mind is lazy planning and they have no clue on what the proper sequence of events should be, so they just use minus lag to hold a date. It becomes really hard when assessing claims on their programme, due to critical path analysis etc.
I cannot find anything on Google so I need your thoughts, I will then write them up as this guy can read English really well, just not understand my broad London accent! He is from Korea.
If anyone has any papers on this subject or can point the way I would be really grateful or just post your thoughts here and I will review them and add them to my write up. I have started the paper but thought I would post here incase I missed anything out.
Thanks