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What Is a Product Requirements Document (PRD)?
A PRD is the blueprint that defines what a product should do, who it's for, and how it should work. It's the single source of truth that aligns product managers, designers, and developers throughout the build process.
| PRD Section | What It Covers |
|---|---|
| Executive Summary | Product vision in 2–3 sentences |
| Target Users | Personas with goals, pain points, behaviors |
| User Stories | Functional requirements as "As a [user], I want..." |
| Non-Functional Reqs | Performance, security, scalability |
| Success Metrics | KPIs to measure product success |
| Timeline | Phased delivery plan with milestones |
How to Write a PRD: Step-by-Step
Start with the problem
Define the problem in 2–3 sentences. Be specific about who has it and why existing solutions fall short.
Define target users
Create specific personas with names, goals, pain points, and behaviors.
Write user stories
Frame requirements as: "As a [user type], I want to [action] so that [benefit]." Prioritize using MoSCoW.
Add non-functional requirements
Performance targets, security standards, accessibility (WCAG 2.1 AA), scalability expectations.
Define success metrics
Set specific, measurable KPIs tied to business goals.
Set a realistic timeline
Break the project into phases with clear milestones.
PRD vs BRD: What's the Difference?
Product teams often confuse PRDs with BRDs. They serve fundamentally different purposes.
| PRD | BRD | |
|---|---|---|
| Purpose | Defines what the product does and how it works | Defines the business need and why we're building it |
| Audience | Product team, designers, developers | Stakeholders, executives, business analysts |
| Focus | Features, user stories, technical specs | Business goals, ROI, market opportunity |
| Written By | Product manager | Business analyst or stakeholder |
| Answers | "What are we building and how?" | "Why are we building this?" |