This comprehensive guide will equip you with the knowledge and tools to create a robust and effective frd template. A functional specification document (fsd), also known as a functional requirements document (frd), is considered by many project management and software. 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. The overall obs covers a wide range of features, which are. A functional requirements document (frd)—also known as a functional requirements specification, functional specification, or functional specification document—is a more.