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. [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. According to the internet, a functional requirements document, abbreviated as frd, is a formal statement of an. The overall obs covers a wide range of features, which are.