lag and lead time

[Jack Dahlgren MVP]

This problem sounds like you are using summary task links so I'm assuming
that you have set the summary task for sect a to be the predecessor of
summary task b.
Then the predecessor of task be would ONLY be task A and enter the 50%
against that.
If you do this then you won't have to set a start task for section b.

I don't find it good practice to link summary tasks, but it sounds like this
is the way your project is set up.

-Jack Dahlgren

 

[Jack Dahlgren MVP]

The 50% is 50% of the predecessor task. If that last task is a 1 day task
then it would be half a day.
You would need to set the entire section summary task as the predecessor to
get it to way the you are expecting.

-Jack Dahlgren

 

[swell estimator]

can you please refer me to a more detailed explanation of lag and lead time
than given in the help section of Project 2003?

Sect A, 29 days duration, Sect B, 36 days duration.

Sect A begins on March 6th and ends on Tues, April 15th

Sect B would start on the W, April 16 but I want it to start 50% after Sect
A has begun.

The help section says enter 50% lead time in the predecessor section but
what predecessor? The last task in Sect A or is the predecessor the summary
line?

I shouldn't have to enter the start day for the first task in Sect B so that
it falls
approx 50% after Sect A has begun, should I?

I could say more but please refer me or walk me through in close detail the
process to set lead time. Thank you.

 

[salgud]

can you please refer me to a more detailed explanation of lag and lead time
than given in the help section of Project 2003?

Sect A, 29 days duration, Sect B, 36 days duration.

Sect A begins on March 6th and ends on Tues, April 15th

Sect B would start on the W, April 16 but I want it to start 50% after Sect
A has begun.

The help section says enter 50% lead time in the predecessor section but
what predecessor? The last task in Sect A or is the predecessor the summary
line?

I shouldn't have to enter the start day for the first task in Sect B so that
it falls
approx 50% after Sect A has begun, should I?

I could say more but please refer me or walk me through in close detail the
process to set lead time. Thank you.

Sounds to me like you're setting dates on your tasks and not using links,
and that is causing your confusion. What you want to do is to remove all
the constraints you've set (you can search this NG for how to do that),
then link your tasks, determining what has to happen before some other task
can be done. Then, the predecessor(s) are obvious and you can add lag or
lead to those links that require it.

To set lead time, find the link in the Entry table (or any other table
that has it) in the predecessor column. Normally it will show an FS and the
task number. For lead time, edit the link to something like FS-5d, which
would be 5d lead.

Hope this helps in your world.

 

[swell estimator]

I removed any links to summary tasks after what you said.

If I have a section C that I want to start on the day that section E is 50%
complete (sect E is 70 days long, thus I want sect C to start on the 35th day
of sect E) shouldn't it be as easy as going to Predecessors for the first
task in sect C and selecting as a Predecessor an unencumbered task (in this
case the last task in sect E) and: Finish to Start, - 50% ?

It doesn't work and why doesn't it work? The task in section E that I
selected as
a Predecessor has FS-50% in the Successors column but the start date of the
task in section C did not recalculate to reflect a start date 50% after the
start of section E. It didn't calculate at all and of course I checked under
Tools/Options/Calculate to make sure the settings were correct.

Please advise. Chris

 

[Steve House]

The "FS-50%" actually isn't 50% after the start of the predecessor, it's 50%
before the end of the predecessor. With 50% it's not important but if you
wanted the successor to start when the predecessor was 3/4 of the way
finished, the link would be "FS-25%." And it's 50% of the duration, not the
calendar elasped time - that too can contribute to it not be exactly halfway
between start and end according to the calendar on the wall. It may be
earlier or later than the 50% elapsed time mark after the start if there are
more non-working days in the one half of the predecessor than there are in
the other half.