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. 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. 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. A functional specification document (fsd), also known as a functional requirements document (frd), is considered by many project management and software. Writing a functional requirements document (frd) is an essential step in the software development process.