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. Are you wondering what a functional requirements document or what an frd is? Use the following priority table. This document underlies the functional requirements for implementing online banking solution (obs) for global bank ltd (gbl).