4. Estimate derived by first
estimating the cost of the project’s
elemental tasks at the lower levels
of the WBS and then aggregating
those estimates at successively
higher levels.
“
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Dictionary of Project Management Terms, 3rd Edition,
J. LeRoy Ward
7. 1. You have a detailed
Work Breakdown
Structure (WBS)
2. You have an
activity list
8. 3. You know the
resources required
for each activity
9. Advantages
• It is the most accurate form of
estimating
• It is the most reliable
• It makes it easier to see the
impact of changes later on
• It enables detailed tracking and
better project control
10. Approach
• Assign the resources to work packages
• Calculate the cost of the work packages
• Roll up all the estimates to the
intermediate level of the WBS
• Roll up the estimates to the project level
