What methods do you use for capacity planning?

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What methods do you use for capacity planning?

Hello gang.  I was wondering what method(s) you use for your capacity planning process?  Do you mostly use home-grown scripts and Excel or 3rd party tools like BEZ?  Personally, I've always used my scripts and then slice and dice with Excel but this might not be the most optimal approach.

Thank you for your input.  I appreciate and and all responses.

-John