By Simon Sovič, Senior Product Manager
A product requirements document (PRD) tells your engineering, design, and business teams exactly what you are building, why you are building it, and what success looks like. Done well, a PRD cuts alignment meetings in half and gives engineers a single source of truth to build from. This guide walks you through writing one from scratch. Budget about two to three hours for your first attempt. Difficulty: beginner to intermediate.
What You'll Need
A clear problem statement or feature request to document
Access to user research, support tickets, or customer interviews (even informal ones)
A basic understanding of your product's current state
A writing tool - Google Docs, Notion, or Confluence all work fine
Roughly two to three hours of focused time
Step 1: Define the Problem Before You Define the Solution
Resist the temptation to open a blank document and immediately describe features. Start by writing one or two sentences that explain the problem your users face. If you cannot write that sentence clearly, you are not ready to write a PRD yet.
Ask yourself: Who experiences this problem? How often? What happens to them when the problem is not solved? Write down your answers in plain language. This becomes the foundation of your document and the lens every reader will use to evaluate your proposed solution.
Tip:Quote real users where possible. A line from an actual support ticket is more persuasive than a vague claim about user pain.
Warning:If you skip this step, you risk building the wrong thing precisely. Engineers and designers need to understand the why before they commit to the how.
Step 2: Write the Overview Section
The overview is a one-page summary that any stakeholder can read in under five minutes and understand what this document covers. It should include:
Document title- descriptive, not just the feature name
Author and date- so readers know who to contact and when it was last updated
Status- draft, in review, approved, or deprecated
One-line summary- what you are building and for whom
Business objective- how this connects to company goals (revenue, retention, activation, and so on)
Keep the overview short. If someone reads nothing else, they should still understand the purpose of the work.
Step 3: List Your Goals and Non-Goals
This is one of the most underrated sections in any PRD. Goals state what the feature or product is designed to achieve. Non-goals explicitly state what it will not do. Both are equally important.
For example, if you are building a CSV export feature, a goal might be "allow users to export their transaction history as a CSV file." A non-goal might be "this release does not support Excel or PDF formats."
Pro tip:Non-goals prevent scope creep. When someone asks for Excel support mid-sprint, you point to the non-goals section rather than having a negotiation every time.
Step 4: Define Your User Stories and Acceptance Criteria
User stories follow a simple format: "As a [user type], I want to [do something] so that [I get this benefit]." Write one story per distinct user need. Do not bundle multiple needs into a single story.
Below each user story, write acceptance criteria. These are the specific, testable conditions that must be true for the story to be considered done. Use plain language. Avoid ambiguity.
Example:
User story:As a finance manager, I want to export transaction data as a CSV so that I can import it into our accounting software.
Acceptance criteria:The exported file includes all transactions from the selected date range. The file downloads within three seconds for datasets up to 10,000 rows. Column headers match the field names shown in the UI.
Tip:Write acceptance criteria as if you are writing a QA test plan. If a tester cannot verify the criterion, rewrite it.
Step 5: Describe Functional Requirements
Functional requirements describe what the system must do. Think of them as the detailed rules that govern the feature's behavior. Write them as numbered statements using "must" for required behavior and "should" for preferred behavior.
Organize them by feature area or user flow. If your feature has five distinct flows, group the requirements under each flow. Use simple numbering like FR-01, FR-02 so that engineers and testers can reference specific requirements in tickets and pull requests.
Tip:Include edge cases. What happens if the user tries to export an empty dataset? What if the session times out mid-export? Thinking through edge cases now saves debugging time later.
Step 6: Add Non-Functional Requirements
Non-functional requirements (NFRs) define how the system must perform, not just what it must do. Common categories include:
Performance:The page must load in under two seconds on a standard broadband connection.
Security:Exported files must not include data from other users' accounts.
Accessibility:All interactive elements must be keyboard navigable and meet WCAG 2.1 AA standards.
Scalability:The feature must handle 500 concurrent export requests without degrading performance.
Many PRDs skip NFRs entirely. In practice, this is where costly bugs and architectural decisions often hide. Spend at least 20 minutes on this section.
Step 7: Include Wireframes or Design References
You do not need a finished design to write a PRD, but you do need enough visual context for engineers to estimate the work accurately. Embed low-fidelity wireframes, annotated screenshots, or links to a Figma file. If designs are not ready, describe the expected UI behavior in plain text.
Tip:Label each wireframe with the user flow it represents and match labels to the corresponding requirement numbers.
Warning:Never treat the PRD as the final design spec. Designs will evolve. The PRD captures intent; the design tool captures the final UI.
Step 8: Define Success Metrics
State how you will measure whether the feature is successful after launch. Tie metrics directly to the goals you wrote in Step 3. Vague goals like "improve user experience" must translate into measurable outcomes like "increase CSV export usage to 500 exports per week within 60 days of launch."
Common metrics product managers track include:
Feature adoption rate (percentage of eligible users who use the feature)
Task completion rate
Error rate or support ticket volume related to the feature
Impact on a broader product metric such as retention or activation
If you are building products at a startup and want a deeper foundation for this kind of strategic thinking, the Product Management for Startups: Essential Guide Covers goal setting, prioritization, and roadmap decisions in more detail.
Step 9: List Dependencies, Risks, and Open Questions
Before you circulate the PRD for review, document anything that could block progress or affect the final shape of the feature.
Dependencies:Does this feature require a third-party API? Does it depend on another team finishing their work first?
Risks:What could go wrong? Flag technical uncertainty, regulatory concerns, or timeline constraints.
Open questions:What decisions are still unresolved? List them explicitly and assign an owner and a target date for resolution.
Open questions are often left out of PRDs because they feel like admissions of incompleteness. In practice, listing them builds trust. It shows you have thought carefully about what you know and what you do not.
Step 10: Get Structured Feedback Before Marking It Approved
Share a draft with at least one engineer, one designer, and one stakeholder from outside the product team before marking the document approved. Ask each reviewer to answer three specific questions:
Is anything unclear or ambiguous?
Is anything missing that you would need to do your work?
Do you see any risks we have not accounted for?
Set a review deadline of two to three business days. After incorporating feedback, update the status to "approved" and communicate the change to the team.
Common Mistakes to Avoid
Writing the solution before the problem.If you jump straight to features, you risk solving the wrong problem entirely.
Skipping non-goals.Without them, every stakeholder will interpret the scope differently.
Using vague language.Words like "fast," "smooth," and "user-friendly" mean nothing to an engineer. Use numbers and observable behaviors instead.
Treating the PRD as permanent.Update it as decisions change. A PRD that reflects yesterday's thinking is worse than no PRD at all.
Writing it alone.A PRD that surprises engineers at sprint planning has already failed. Involve the team early, even informally.
Confusing a PRD with a product spec or a design spec.A PRD defines the what and why. Technical specs and design specs define the how.
Frequently Asked Questions
How long should a product requirements document be?
There is no fixed length. A simple feature might need two pages. A complex platform capability might need fifteen. Focus on completeness over length. Include everything a reader needs to do their job. Cut everything else.
What is the difference between a PRD and a product spec?
A PRD defines what you are building and why, the goals, user stories, and success metrics. A product spec (or technical spec) goes deeper into how the system will be built, covering architecture, APIs, and data models. Engineers usually write the technical spec after the PRD is approved.
What is the product manager vs product owner difference and does it affect who writes the PRD?
A product manager typically owns strategy, discovery, and roadmap decisions. A product owner (a role that comes from the Scrum framework) focuses on the backlog and sprint-level delivery. In practice, the titles overlap heavily across companies. Both roles write PRDs, though the format and level of detail may differ depending on the team's process. What matters more than the title is that the person writing the document has a clear understanding of user needs and business goals.
Do agile teams still write PRDs?
Many agile teams use lighter formats like one-pagers, opportunity canvases, or detailed user stories instead of formal PRDs. The underlying thinking is identical. You still need to define the problem, scope, acceptance criteria, and success metrics. The format is secondary to the quality of the thinking behind it.
How often should you update a PRD?
Update it whenever a significant decision changes - scope, timeline, design direction, or technical approach. Add a changelog section at the top so readers can see what changed and when without reading the entire document again. Archive old versions if your tool supports versioning.
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