A functional requirements document (frd)—also known as a functional requirements specification, functional specification, or functional specification document—is a more. According to the internet, a functional requirements document, abbreviated as frd, is a formal statement of an. Documenting the functional requirements provides several important benefits to the organisation and to the process of developing a solution. [provide a list of contractual or task level assumptions and/or constraints that are preconditions to preparation of the frd. Assumptions are future situations beyond the control of the project,.