Documenting the functional requirements provides several important benefits to the organisation and to the process of developing a solution. The functional requirements document (frd) is a formal statement of a product's functional requirements. To help you upsurge towards your business goals, we suggest you to try using a business requirements document. It allows you to apply a ratings system to your requirements, so you have the visibility (into the value, status, and description of each requirement) that’s. [provide a list of contractual or task level assumptions and/or constraints that are preconditions to preparation of the frd.