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Which model is used during early stages of the system design after the requirements have been established?

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Which model is used during early stages of the system design after the requirements have been established?

(a) An application-composition model

(b) A post-architecture model

(c) A reuse model

(d) An early design model

I had been asked this question in an interview.

This interesting question is from Size and Cost Estimation of Software topic in chapter Software Management of Software Engineering

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Correct option is (d) An early design model

Explanation: Estimates are based on function points, which are then converted to number of lines of source code. The formula follows the standard form discussed above with a simplified set of seven multipliers.

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