Projecting resource requirements

Can anyone point me to some documents on calculating
resource requirements for a project? I'm ok with disk
consumption but cpu and memory seem harder to project.

What I've done so far is get their ERD and ask them to
give me the list of questions/queries they will be
asking and the frequency of each. If there's a doc out
there with a formal list of questions and some of the
process you go thru to determine resource consumption
that would be great.

Thx, Dave

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