Not refining estimates by using progressive elaboration, not reviewing schedules which can impact budgets as schedule changes occur, and not reviewing historical data from previous projects which may have different contexts are three additional pitfalls of estimating outlined in the document. The document recommends refining estimates iteratively, using earned value to track schedule and budget changes, and normalizing historical data before using it to improve estimating.

1. 3 More Pitfalls of
Estimating

2. Here are some
more things to
watch out for
when estimating:

3. 1. Not refining
estimates

4. Estimating is
iterative
Use progressive elaboration
to refine your estimates

5. 2. Not reviewing
your schedule

6. Estimates are
affected by
duration
Schedule changes affect
budget changes: use Earned
Value if it helps

7. 3. Not reviewing
your data

8. Historical data
isn’t always
appropriate
Previous projects had
different contexts:
normalize historical data
before you use it

9. 3 More pitfalls of
estimating:
• Not refining estimates
• Not reviewing your schedule
• Not reviewing your data

10. Check the PMI Practice
Standard for Project
Estimating for more
details

11. www.GirlsGuideToPM.com