Re: Task Start Dates

Tech-Archive recommends: Fix windows errors by optimizing your registry

Hi Trevor and all,

I LOVE this explanation as much as I DISLIKE negative lag. :-)

--
Jan De Messemaeker
Microsoft Project Most Valuable Professional
http://users.online.be/prom-ade/
+32-495-300 620
"Trevor Rabey" <trabey@xxxxxxxxxxxxxxxxxxxxx> schreef in bericht
news:43eb30a7@xxxxxxxxxxxxxxxxxxx
I hate to split hairs, but I think that's not quite what it means, without
qualification, and the exact meaning can be important.
It means, that:
if we are scheduling forwards iaw with good Critical Path Method (you
would
have to like pain to do anything else)
and if there are no date constraints to consider on either Task (Task
Properties, Constraint Type and Date)
and if both Tasks use the same Calendar and there are no other Calendar
considerations (eg Resource Calendars, Working Time)
and bearing in mind that we are talking about working days rather than
edays
and if there is no progress recorded in Actuals along with Tasks having
been
re-scheduled and perhaps split, depending on calculation options,
and if there are no other Predecessor Links with other Tasks
and if there is no Resource Leveling involved

.. and we may as well throw in Task Type and effort driven as a
consideration except that it would seem to be the only thing that doesn't
have to be kept in mind here because it can only affect duration which
also
doesn't come into this case.

Then Task 101 will be scheduled to start as soon as possible (Day 1), but
NO
SOONER than 10 days before Task 100 starts, because, according to what you
have put into your model, it can't (due to something immutable like the
law
of gravity). So it means don't expect to be able to do it sooner than this
(and if it is on the critical path make sure you do it no later).

When you actually come to do it the condition may not be so strict after
all
and you can do it sooner, and choose to or not, or other events not
modeled
may prevent it from happening that soon anyway.

However, after all this arduous thinking, unless start of Task 100 is a
fixed Date (like the opening ceremony of the olympic games or a solar
eclipse) in which case Task 101 is also a fixed Date, we have a situation
where the "trigger" event for Task 101 is in its own future. Since you can
never know for sure when you are at 10 days sooner than the start of Task
100 until after it has happened, Task 101 can never be started. The
software
let's you plan it even though it can't be executed. Suggest sticking with
FS
Links and positive lag.


"Rick Roszko" <RickRoszko@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:ADD63287-394C-4D92-8A56-B2F46D9C44A5@xxxxxxxxxxxxxxxx
By 2 weeks you mean 10 business days I assume?

Let's say you have task 100 and task 101

In predecessors for the second task (101), put in 100SS-10d
which means task 100 will start 10 days befor task 100 starts




--
Rick Roszko
PM, MSPS, Network Consultant


"Diane" wrote:

How do I create a start date that is 2 weeks prior to another task?




.

Relevant Pages

  • Re: Task Start Dates
    ... I hate to split hairs, but I think that's not quite what it means, without ... and if both Tasks use the same Calendar and there are no other Calendar ... and bearing in mind that we are talking about working days rather than edays ... and if there are no other Predecessor Links with other Tasks ...
    (microsoft.public.project)
  • Re: Duration calculation
    ... To clarify -- changing the information under Tools> Options, Schedule ... For details on changing the working time in Project 2007, ... Modify the calendar through Tools> Change Working Time. ... View tab: Date format showing date and time. ...
    (microsoft.public.project)
  • Re: Duration calculation
    ... a pain in Project 07 to do it under tools, change working time. ... Modify the calendar through Tools> Change Working Time. ... View tab: Date format showing date and time. ... Remember that duration is always measured in minutes and fractions ...
    (microsoft.public.project)
  • Re: Working Calendars
    ... I actually clicked on the default working time in the change working times ... calendar and changed that calendar to reflect 7:45 to 4:15 pm. So now when I ... Jackie Duncan ... common resource pool and changed the default working times, ...
    (microsoft.public.project)
  • Re: Working Calendars
    ... I actually clicked on the default working time in the change working times ... calendar and changed that calendar to reflect 7:45 to 4:15 pm. So now when I ... Jackie Duncan ... did you also insure each resource uses that custom calendar? ...
    (microsoft.public.project)