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Yes it is possible to combine process models. It is the spiral process model.This model of development combines the features of the prototyping model and the waterfall model

Let us consider the case study of the baggage-handling system at the Denver International Airport (DIA) again. Initially, DIA had intended that each individual airline would be responsible for building its own baggage-handling system. However, as the construction of the airport progressed, a larger vision emerged for the inclusion of an airport-wide integrated baggage-handling system that could provide a major improvement in the efficiency of luggage delivery and no one gave any thought to risk assessment. The essential concept of the Spiral Model is to minimize risks by the repeated use of prototypes and other means. Unlike other models, at every stage risk analysis is performed. The Spiral Model works by building progressively more complete versions of the software by starting at the center of the spiral and working outwards.

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Q: Is it possible to combine the process models?
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