The Most Common Requirements Documents and How to Use Them

Executive Summary

Knowing which requirements document to use at the correct time can mean the difference between an efficiently designed, successful project and one that takes years to complete with roadblocks popping up at every turn. For any project to be successful, good requirements documents are key. In this PDF, we go into detail about which requirements documents are most common for engineering projects, and how they can be used to maximize organization and productivity while writing requirements.

Of the many different types of requirements documents, three continually stand out as key to any engineering project: The Product Requirements Document (PRD), Functional Requirements Document (FRD), Software Requirements Document (SRD), or Software Requirements Specification (SRS) are essential tools for any requirements author. Used correctly, these documents can ensure your project is timely, organized, and within budget. Each of these documents is different in content and design and serves a specific purpose for its respective project phase. We’ll cover each of them in detail to help you understand the differences and why each is essential to the requirements authoring process.

In this guide, we go through: what is a product requirement document; what can be found in a requirements document; what is a functional requirement document and what should be included; what is a software requirements document; and what information is found within it, plus how to use these documents together and get the most out of them.

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