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Which two models doesn’t allow defining requirements early in the cycle?

/ Models & Software Development, Software Processes / By admin

Which two models doesn’t allow defining requirements early in the cycle?

A. Waterfall & RAD
B. Prototyg & Spiral
C. Prototyg & RAD
D. Waterfall & Spiral

Explanation: Prototyg Model starts with a requirements analysis phase including techniques like FAST, QFD, Brainstorming.In case of Spiral model the first phase involves activities related to customer communication like determining objectives.