A Functional brief, in project management, is a document that talks about the functional specifications of the product that is being developed. A well defined functional brief allows for all stakeholders to be aware of the scope of the product, the intended functionality and when finalized ensures that there is no feature creep. Once the document is created it is used to conduct a feasibility study and can be used to develop costs and time estimates of the final product.
The document should highlight:
The Functional brief can also contain information about the future plans for the product so that developers can ensure that while designing the product these considerations are included.
References
Functional brief Wikipedia(Text) CC BY-SA