15 SRS, BRD

There are a few closely-related document types that you’ll come across:

SRS, SRD, Software Requirements Specification, Software Requirements Document: This is the type of document that you’ll normally be producing. It is the requirements for the software, hopefully incorporating the how, what, and why of the software to be produced or modified.

BRD, BRS, Business Requirements Document, Business Requirements Specification: This is a document that specifies what the business needs, and why. This often comes before the SRS and is the reason for the SRS.

FRS, FRD, Functional Requirements Specification, Functional Requirements Document, or just Functional Spec: This document is sometimes produced in Waterfall projects, as the detailed as-built documentation, produced during the internal design and development stages. This last document is generally not the concern of the business analysis or requirements documentor.