Well, for milestones the issue is moot - since they simply flag a single
point in time with a length of zero by definition, there is no distinction
between "duration zero" and "elapsed zero." They mark an instantaneous
event, a state transition in the project, say from a condition of "contract
not signed" to the condition of "contract signed, okay to proceed."
Milestones occur on a date, the date the transition takes place, and very
often carry a deadline, the date by which they are required to take place,
but those dates are perfectly conventional calendar dates and the
distinction between duration and elapsed time is irrelevant.
Likewise, for something like a support period the issue also is moot.
"Support Period" is not a task, it simply the name of a time window. Tasks
are always visible work done by a resource. Your contracted post delivery
support period might be 6 months but if the support person is only makes one
support visit and spends a day with the client, the only TASK involved is
"Support Call," it's duration is 8 hours, and those 8 hours can only occur
during the working time calendar of the resource, hence only working time,
ie, duration, is what matters. If that call comes Friday at noon, he's
probably going to work Friday afternoon, knock off for the weekend, and
finish up Monday morning. Elapsed time says he'd work on Friday night and
in fact not rest for even a minute until the problem is solved. All the rest
of the time during that 6 month period might as well not exist as far as
project work scheduling is concerned, the only thing MS Project is concerned
with scheduling is that one 8 hour period the resource was physically
working on the client's issue.
You can certainly mix and match elapsed time where it is applicable with
conventional durations in the same project - just enter the duration with
"e" prefixed to the unit, ie, "3ed" or "32eh." A task with "24h" in the
duration column will end 24 working time hours after it starts while one
entered as "24eh" will end 24 clock hours after it starts.
--
Steve House
MS Project Trainer & Consultant
battsman said:
Steve House wrote:
-To be honest, I can't conceive of any reason to use elapsed
times for anything other than continuous, essentially unattended
processes such as a burn-in period on a piece of electronic hardsware or
an automated test procedure, something like that. For human activities,
measuring time in
terms of working time is far more reliable.[/-INDENT]
A similar example of a reason for elapsed times would be contractual
obligations based on calendar days (e.g.: Mandated operational
availability demonstrations, support periods, etc.). Do you have any
suggestions of how you could "mix and match" duration types within a
given project? (i.e. Use actual labor expended minutes (work days) for
most lines, but calendar / elapsed time for certain lines.) I have
projects that I track most activities by labor, but require certain
milestones to be tracked strictly based on calendar days.
Thanks,
B
--
battsman
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