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Disclaimer - Alliance Digital Repository

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17<br />

subsystems that were previously built are maintained and integrated in accordance with<br />

changed requirements.<br />

Figure 3 - Spiral Model (Boehm, 1988)<br />

Another one of the more popular methodologies used in application development<br />

is the Prototyping Life Cycle. Artz (1996) seems to disfavor this methodology because<br />

he believes that prototypes are difficult to maintain and frequently take more time to<br />

design. Fioravanti (2005), on the other hand, does not specifically disapprove this<br />

methodology but rather presents two different versions of Prototyping Life Cycles from

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