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

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

(a) Waterfall & RAD

(b) Prototyping & Spiral

(c) Prototyping & RAD

(d) Waterfall & Spiral

The question was posed to me by my school teacher while I was bunking the class.

My enquiry is from Selection of a Life Cycle Model in portion Software Processes, Models and Agile Software Development of Software Engineering

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Correct option is (b) Prototyping & Spiral

The explanation: Prototyping 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.

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