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,. Use the following priority table. 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. This document underlies the functional requirements for implementing online banking solution (obs) for global bank ltd (gbl).