Basic resource assignment-duration question

P

Projectina

Well,

I am in the process of studying MS Project and although I can
comprehend many aspects of it, something about the most rudimentary
beginning concepts bugs me, and it must be I've not read something that
explains the paradigm Project uses in regard to default task duration
and assignments.

Once I understand the premise of this, I'm sure everything will click.
Or maybe I _am_ that dumb :/

SCENARIO:
I have one task in my entire project for a duration of 1 day.

I assign a resource that only has 50% max units availability (but still
assign him with 100% assignment units). So basically since I am using
the default project calendar (8am-5pm, 8 hour days), the task requires 8
hours of work, and the resource I assigned to it can only work 4 hours
per day.

That being the case, it would now take this task 2 days to complete
since that resource can only put in 4 hours per day.

But it still shows the duration as 1 day for the task.

If I assign a resource with 100% max units, the task duration also
remains one day.

Soooooooooo I know that in essence, with the 50% resource, the task
still will have 50% work remaining where as the 100% resource will
complete the task if they work on it as planned.

So maybe I'm not explaining my dilema correctly, but when I think of
planning work, I try and determine how many man-hours for 1 FTE a task
will take.

If I think it will take 1 person 40 hours to code a web page, I can put
the duration for that task as 5 days since initially, no resource are
assigned - so the duration for ANY task in my mine, during the planning
stage, is for one FTE.

If I assign 5 people to that 1 task, in therory it could be done in 1
day now.

So I expect that when I assign a resource, the initial task duration
would be adjusted based on the units of the resources assigned to that
task.

But as I mentioned, the new task of 1 day duration remains 1 day after
I assign a resource to it that only has 50% max units.

If I explained myself ok (sorry for being so long winded), what concept
am I missing?
 
M

Mike Glen

Hi Projectina ,

Welcome to this Microsoft Project newsgroup :)

You might like to have a look at my series on Microsoft Project in the
TechTrax ezine, particularly #5 on resources, at this site:
http://tinyurl.com/2xbhc or this:
http://pubs.logicalexpressions.com/Pub0009/LPMFrame.asp?CMD=ArticleSearch&AUTH=23
(Perhaps you'd care to rate the article before leaving the site, :)
Thanks.)

FAQs, companion products and other useful Project information can be seen at
this web address: <http://www.mvps.org/project/>

Hope this helps - please let us know how you get on :)

Mike Glen
MS Project MVP
 
J

Jan De Messemaeker

Hi,

This si exactly why I try to avoid using percentages at all cost.
Instead of teling Project the capacity is 50% leave it to 100% and make
aresource calendar for 4 working hrs a day. Then Project does exactly as you
and me would expect.

--
Jan De Messemaeker
Microsoft Project Most Valuable Professional
+32 495 300 620
For availability check:
http://users.online.be/prom-ade/Calendar.pdf
 

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