![]() ![]() The bottom-up estimation models entail aggregating individual estimates for each task in the Work Breakdown Structure (WBS). The top-down approach entails the project manager charting out overall project size, functionality, process, environment, people, and required quality level, estimate macro level costs, and partition the estimate into a top-down work breakdown structure. The two broad approaches of cost estimation are the top down approach and the bottom-up approach.
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