FRS includes requirements, converted into functionality and says that how this requirement is going to work as a part of proposed system. FRS includes requirement converted into the way it is going to work as a part of proposed system.
When the team agrees that functional specification consensus is reached, the functional spec is typically declared "complete" or "signed off". After this, typically the software development and testing team write source code and test cases using the functional specification as the reference. While testing is performed, the behavior of the program is compared against the expected behavior as defined in the functional specification.
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