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Which two of the following models will not be able to give the desired outcome if user’s participation is not involved?

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Which two of the following models will not be able to give the desired outcome if user’s participation is not involved?

(a) Waterfall & Spiral

(b) RAD & Spiral

(c) RAD & Waterfall

(d) RAD & Prototyping

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I need to ask this question from Selection of a Life Cycle Model topic in chapter Software Processes, Models and Agile Software Development of Software Engineering

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The correct choice is (d) RAD & Prototyping

The explanation is: Active Participation of user is involved in all the four phases of RAD model and in case of the Prototyping model we need user’s presence/involvement every time a new prototype is build or designed.

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