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By mitchp
via agile.dzone.com
Published: Dec 27 2012 / 08:42

For decades now, the project management world has been divided between top-down estimation and bottom-up estimation. While a top-down approach might have limitations, it is perhaps the only way to get some meaningful estimates at the start of a project. A bottom-up approach might be a great way to get more accurate and reliable estimates but you might have to wait for a problem to be whittled down to a small level to get reliable estimates. Both are required for a comprehensive and useful project planning, but unfortunately, most people use one over the other, and the Agilists abandoning top-down in favor of the highly accurate but low-lookahead bottom-up methods.
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