Once you have produced your Requirements Specification you have to find a supplier, obtain quotations, evaluate them and then having chosen a supplier you will need to manage them.
Responding to supplier questions. It will rarely be possible to ensure that the FRS is 100% complete, and the supplier will invariably find issues that need resolving. Often this will involve updating the FRS.
Approving the suppliers FDS:
Often a supplier will produce an FDS and then request the end users approval. Beware, because the intention is often to limit the suppliers scope. Whilst it is reasonable that the scope should be defined in detail, it is not reasonable that the scope should be defined in covert ways.
Another issue is Ownership of the Application Code.
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