July 2001
Intermediate to advanced
656 pages
15h 51m
English
book
Applying UML and Patterns: An Introduction to Object-Oriented Analysis and Design and the Unified Process, Second Edition
by Craig Larman
Content preview from Applying UML and Patterns: An Introduction to Object-Oriented Analysis and Design and the Unified Process, Second Edition
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36.7. The (In)Validity of Early Estimates
Garbage in, garbage out. Estimates done with unreliable and fuzzy information are unreliable and fuzzy. In the UP it is understood that estimates done during inception are not dependable (this is true of all methods, but the UP acknowledges it). Early inception estimates merely provide guidance if the project is worthy of some real investigation in elaboration, to generate a good estimate. After the first elaboration iteration there is some realistic information to produce a rough estimate. After the second iteration, the estimate starts to develop credibility (see Figure 36.6).
Figure 36.6. Estimation and project phases.
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Useful estimates require investment in some elaboration iterations. |
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