Which document captures all the details of software requirements?

The Software Requirements Specification (SRS) is the comprehensive document that outlines all the details of software requirements. It serves as a foundational framework that defines what the software is supposed to do, capturing both functional and non-functional requirements. This document is essential for ensuring that all stakeholders, including developers, testers, and clients, have a clear and mutual understanding of the project scope and requirements.

The SRS typically includes a detailed description of the software functionalities, constraints, interface requirements, and any preset conditions of operations. It acts as a reference point throughout the software development lifecycle, helping to verify that the final product meets the stipulated requirements.

Other documents, such as the Software Design Document (SDD), focus on the architecture and design aspects of the software rather than specifying the requirements. The Technical Specification Document (TSD) is more about the technical details and implementation guidelines, while the User Interface Specification (UIS) concentrates specifically on the layout and design of the user interface, rather than the overall requirements. Each of these serves distinct purposes, but none replace the comprehensive capturing of software requirements as accomplished by the SRS.