Page 1403 - (ISC)² CISSP Certified Information Systems Security Professional Official Study Guide
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Waterfall Model
Originally developed by Winston Royce in 1970, the waterfall model
seeks to view the systems development lifecycle as a series of iterative
activities. As shown in Figure 20.2, the traditional waterfall model has
seven stages of development. As each stage is completed, the project
moves into the next phase. As illustrated by the backward arrows, the
modern waterfall model does allow development to return to the
previous phase to correct defects discovered during the subsequent
phase. This is often known as the feedback loop characteristic of the
waterfall model.
FIGURE 20.2 The waterfall lifecycle model
The waterfall model was one of the first comprehensive attempts to
