If you are unfamiliar with this document, do not be vexed. Writing a functional requirements document (frd) is an essential step in the software development process. Assumptions are future situations beyond the control of the project,. This comprehensive guide will equip you with the knowledge and tools to create a robust and effective frd template. A functional requirements document (frd)—also known as a functional requirements specification, functional specification, or functional specification document—is a more.