A functional specification document (fsd), also known as a functional requirements document (frd), is considered by many project management and software. This document is a functional requirements document (frd) template that outlines the sections and content needed for documenting software requirements. To help you upsurge towards your business goals, we suggest you to try using a business requirements document. If you are unfamiliar with this document, do not be vexed. Business requirements documents (brds) center on strategic objectives, business processes and user needs at a high level.