LINK TWO TASKS WITH HARD CONSTRAINT

[John Boy]

Thought I had posted this yesterday?
We need to have a hard link between two tasks i.e x days from commencement
of task A need task B to start. We can do this by linking (FS) A to B with a
-"x"days lag. If you then move task A task B keeps its relationship. Problem
is if you accidentially or via leveling etc move B out to the right the
relationship is not correct i.e. constraint is only in one direction.

Any ideas please!

John

 

[Jan De Messemaeker]

Hi,

Not only have you posted it, there have been several replies - you seem not
to have noticed that.
This only works if task A had a MUST constraint or if it is a critical task.
In that case you put an FS link B to A and give B the constraint of As Late
As Possible.
HTH

 

[John Boy]

Jan, thanks for the reply. For the life of me I cannot see my original post
nor obiously any replys. Did I post it in wrong area? I can only see another
diffrent subject post from previous day with 5 replys and this post with
your reply??? I am in India at present and know that blogs are being blocked?

Rehards

John

 

[Jan De Messemaeker]

Hi John,

No idea what may have happened, sorry.

 

[Steve House]

Here was my reply and explanation to your first posting on this ...

Links are permissive critters - they specify the time after when the
successor task is allowed to start, not when it WILL start. There will
always be factors that can influence its start and make it later than
the link says it should. Suppose task B was supposed to start 2 days
after task A and task A started Monday ... task B should start on Wed
according to the link but suppose when Wed came around the only resource
qualified to do task B called in sick? There's no choice but to delay
it and Project recognizes such realities.

Think of predecessor as meaning "controlling" and successor as meaning
"controlled." The start of task A plus a 2-day delay is what permits
task B to start, so task B is scheduled to start 2 days after A starts
if it otherwise possible for it to start then. So the link between the
two tasks is Start-Start with a 2 day lag time.

There really iks no way in Project to guarantee that B will start 2 days
after A, any more than it is possible in the real world to absolutely
guarantee without fail under any circumstances that it will occur that way.


HTH