differences between bottom-up and top-down estimating approaches

Differences between bottom-up and top-down estimating approaches

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What are the differences between bottom-up and top-down estimating approaches? Under what conditions would you prefer one over the other? Top-down estimates usually are derived from someone who uses experience and/or information to determine the project duration and total cost. Many times these estimates are made by top management who have little knowledge of the processes used to complete the project.
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Unformatted text preview: Bottom-up estimates are estimates that are made by the work package level, by people who know the actual process of completing the project. It is said that they come up with low-cost and efficient methods. I think that in most conditions I would prefer the bottom-up approach because that involves everyone in the company and the more people you have the better ideas you can come up with....
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This note was uploaded on 02/24/2012 for the course STAT STAT taught by Professor Unknown during the Spring '10 term at DeVry Phoenix.

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