Writing a functional requirements document (frd) is an essential step in the software development process. This document is a functional requirements document (frd) template that outlines the sections and content needed for documenting software requirements. [provide a list of contractual or task level assumptions and/or constraints that are preconditions to preparation of the frd. A functional specification document (fsd), also known as a functional requirements document (frd), is considered by many project management and software. Assumptions are future situations beyond the control of the project,.