Odds of Completing on Time
Many projects are perceived to be slow; however, not all projects are slow in the same way. Some development efforts really are slow, and others merely appear slow because of unreachable effort estimates.
One view of software-project estimation holds that every project has one exact time at which it should be completed. This view holds that if the project is run well, there is a 100-percent chance that it will be completed on a particular date. Figure 6-5 shows a graphical representation of that view.
Most developers' experience doesn't support this view. Many unknowns contribute to software schedules. Circumstances change. Developers learn more about the product they are building as they build it. Some practices work ...
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