How to calculate the size of a project in the days-person unit of measurement?

Posted by Will Marcouiller on Programmers See other posts from Programmers or by Will Marcouiller
Published on 2011-02-18T15:28:35Z Indexed on 2011/02/18 15:33 UTC
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Filed under:

career-development

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learning

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project-management

Once in a while I have read here and there the size of a project expressed in a matter of days-person or person-day.

I may understand what this means, but I don't know on what do people base themselves to calculate it.

What are the variables considered into this calculation?
How these variables are used in the calculation formula?
Otherwise, how to estimate it grossly, when something is missing from the formula's variables?

Thanks! =)

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