September 2003
Intermediate to advanced
272 pages
8h 36m
English
Content preview from The Laws of Software Process
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67
The Logic of Life Cycles
A More-Complex, Generalized Model
Unfortunately, our woes do not stop there. There are a number of other
factors that affect how our project may run, including:
• Unknown unknowns (Second Order Ignorance)
• Knowledge variability with time
• Design dependence of knowledge
• Variability in the rate of learning with time
The effects of these are shown in Exhibit 18 through Exhibit 22.
Range of Unknown Unknowns
This is simply the result of Second Order Ignorance (see Exhibit 18). For
projects with many “new” variables, we can expect this to be high. For
Exhibit 17. Knowledge is harder to get.
Exhibit 18. Range of unknown unknowns. ...
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