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Explain advantage of use case diagram? Draw use case diagram for Online Examination System.

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Ans. Advantage of use case diagram
·         Use case help to capture the functional requirements of a system.
·         Use cases are traceable.
·         Use cases can serve as the basis for the estimating, scheduling, and validating effort.
·         Use case can evolve at each iteration from a method of capturing requirements, to development guidelines to programmers, to a test case and finally into user documentation.
·         Use case alternative paths capture additional behavior that can improve system robustness.
·         Use cases have proved to be easily understandable by business users, and so have proven an excellent bridge between software developers and end users.

use case for online examination system

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