An frd defines the specific functions and features that the. [provide a list of contractual or task level assumptions and/or constraints that are preconditions to preparation of the frd. Business requirements documents (brds) center on strategic objectives, business processes and user needs at a high level. To help you upsurge towards your business goals, we suggest you to try using a business requirements document. 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.