PRD (Product Requirements Document)
A written document that describes what a product or feature should do, why it exists, and how success will be measured — before engineering begins.
What is a PRD?
A Product Requirements Document (PRD) is a written artifact that defines the scope, purpose, and success criteria of a product feature or initiative. It is the primary communication tool between product management and engineering, design, and QA.
A well-written PRD answers three questions:
- What problem are we solving, and for whom?
- What should the product do to solve it?
- How will we know if it worked?
What a PRD typically contains
| Section | Purpose |
|---|---|
| Problem statement | The user pain being solved and the evidence for it |
| Goals & non-goals | What success looks like — and what's explicitly out of scope |
| User stories | Scenarios written from the user's perspective |
| Functional requirements | What the system must do (P0 / P1 / P2 priority) |
| UX & design requirements | Accessibility, layouts, Figma links |
| Technical constraints | Performance targets, API dependencies, security |
| Success metrics | Measurable outcomes with baselines and targets |
| Timeline & milestones | Key dates for design, engineering, QA, launch |
| Open questions | Unresolved decisions that could change scope |
PRD vs BRD vs MRD
| Document | Who writes it | What it covers |
|---|---|---|
| MRD (Market Requirements Document) | Product / Marketing | Market problem, opportunity, customer segments |
| BRD (Business Requirements Document) | Business analyst / PM | What the business needs — common in enterprise IT |
| PRD (Product Requirements Document) | Product Manager | What the product should do — standard in tech companies |
In most startups and tech companies, the PRD is the only document that matters. MRDs and BRDs are artifacts of older enterprise processes.
When to write a PRD
Write a full PRD for features that:
- Span multiple teams or require cross-functional alignment
- Carry high ambiguity about scope or approach
- Have significant user journey changes
- Take more than one sprint to build
For small changes (< 1 sprint, single team, low ambiguity), a well-written Jira or Linear ticket with acceptance criteria is usually enough.
Common PRD mistakes
- Starting with solutions instead of problems. A PRD that leads with "build a dashboard" instead of "users can't see their data without exporting to Excel" is a requirements document for the wrong thing.
- No non-goals. Listing what you're not building is as important as what you are. Without it, scope creep is inevitable.
- Unmeasurable success metrics. "Improve user experience" is not a metric. "Reduce time-to-complete onboarding from 8 minutes to 4 minutes" is.
- Written in isolation. The best PRDs are co-authored with an engineering lead. Their early input on feasibility prevents late rewrites.
Free templates for PRD
Frequently asked questions
How long should a PRD be?
2–5 pages for most features. 8–12 pages for large platform bets. If it's longer than 15 pages, split it. The goal is to be unambiguous, not comprehensive.
Should engineering be involved before the PRD is written?
Yes. Involve an engineering lead in the problem statement and scope sections. Their input on feasibility and constraints makes requirements more realistic and avoids late rewrites.
Does every feature need a PRD?
No. For changes under 1 sprint with low ambiguity, a detailed Jira ticket is sufficient. Reserve the full PRD for features with cross-team scope, significant user journey changes, or high uncertainty.
What's the difference between a PRD and a spec?
A PRD defines what to build and why (product perspective). A spec defines how to build it (engineering perspective). A PRD precedes the spec. In some teams, the spec is written inside the PRD as a separate section.
Apply PRD to your real product data
PMRead ingests customer feedback, interviews, and Slack threads — and generates PRDs grounded in real evidence.
Related terms
RICE Scoring
A quantitative feature prioritization framework that scores each initiative by Reach, Impact, Confidence, and Effort — producing a single number to rank your roadmap.
OKR (Objectives and Key Results)
A goal-setting framework where an Objective states what you want to achieve and Key Results define the measurable outcomes that prove you achieved it.