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Define Requirement Engineering.
Requirement Engineering is a process that includes all of the activities needed to create and maintain a system requirements document.
The four generic Requirement Engineering activities are:
Requirement Elicitation & Analysis, Requirement Specification, Feasibility study, Validation.
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A set of people, machines, and methods prepared to accomplish a set of specified functions.
Hybrid design: Pure top-down or pure bottom up approaches are often not practical thus hybrid approach which combines the above two approaches is often used.
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