SRS = Software Requirement Specification CRS = Customer Requirement Specification FS = Functional Specification
SRS: A software requirement is something the customer wants the software to do because it would be useful. For example, a software requirement might be that the application run on Windows 2000 and Linux. This is a requirement because some of the employees in the company use Windows 2000 and others use Linux.
CRS: Requirements that reflect the stated or implied needs of the customer
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