Documenting the functional requirements provides several important benefits to the organisation and to the process of developing a solution. An frd or functional requirements document serves as a contract for formal statement, between the business stakeholders and the technology team, on an application’s functional requirements. [provide a list of contractual or task level assumptions and/or constraints that are preconditions to preparation of the frd. A user requirements document, written by the product manager, is centered around the end user’s needs and expectations for a product.it translates user requirements into. 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.