Planet RoadmapA product requirements document is a short written artifact that explains what a product or feature is for, who it serves, what it should do, and how you will know it succeeded. Done well, it is the alignment tool between product, engineering, design, and stakeholders before substantial work begins. Done badly, it is a 30-page document nobody reads. The difference is structure and discipline — both of which are easy to copy.
What a PRD Is For
The point of a PRD is to surface and resolve disagreements before the team is committed to building. It captures the problem, the proposed shape of the solution, the goals, the non-goals, and the open questions. If two reviewers read the same PRD and walk away with the same understanding of what is going to be built and why, the PRD has done its job.
A PRD is not a technical specification. It does not need to specify the schema or the API. That belongs in a separate spec or an RFC, often written by an engineering lead after the PRD is approved.
The Core Sections of a PRD
These are the sections that earn their keep across most product organizations. Skip any that do not apply to the feature, but do not invent new ones unless you have a reason.
- Summary — one sentence anyone could read in five seconds.
- Problem — what is broken today, framed in user terms.
- Target users — who specifically benefits. Be precise.
- Goals — what success looks like. Each goal should be testable.
- Non-goals — what you are explicitly NOT doing. Prevents scope creep more reliably than goals do.
- Proposed solution — the shape of the solution, not the full design.
- User stories — how real users experience the feature.
- Success metrics — measurable, with a target.
- Open questions — unresolved decisions you need help with.
- Risks and dependencies — what could go wrong and what you are relying on.
How Long Should a PRD Be?
As short as it can be while still aligning the team. For a small feature, one page is plenty. For a quarter-sized initiative, two to four pages. Anything longer than that and the work is probably better split into smaller pieces, each with its own PRD.
Length is not a quality signal. The best PRD I have ever written was 600 words. The worst was 8,000. Treat every word as if it costs time — because reviewers reading it spend time, and they are usually expensive.
PRD vs Spec vs RFC
These three terms get conflated and it causes confusion. A PRD focuses on the "what and why" — the user problem, goals, and constraints. A technical spec focuses on the "how" — architecture, schema changes, API contracts. An RFC (Request for Comments) is a proposal seeking feedback on a decision and can apply to either domain.
For larger initiatives you may write all three: a PRD that defines the goal, an RFC that aligns on the technical approach, and a spec that captures the implementation contract. For smaller features, a single combined PRD with a brief technical sketch is enough.
Keeping a PRD Alive After Kickoff
Most PRDs go stale the day after the kickoff meeting. The team learns something, makes a different decision, and the doc no longer reflects reality. Stale PRDs are worse than no PRD because they actively mislead newcomers.
Keep the PRD alive with two habits. First, edit Open Questions as they get resolved — do not just delete them, mark the resolution. Second, add a Decisions log: a short list of decisions made after kickoff, with the date and rationale. The log is small but it preserves the institutional memory that matters most.
Common Mistakes
The most common mistake is jumping to solution. The Problem section reads like a spec because the author already knew what they wanted to build. Force yourself to describe the problem as a user would feel it, not as you have already framed it.
The second most common is omitting non-goals. Goals shape the team's ambition; non-goals shape its restraint. A PRD with no non-goals is a PRD that will scope-creep within two weeks.
The third is over-precision on metrics. "Increase activation" is not a metric. "Increase the percentage of new users completing onboarding from 42% to 55% within 60 days of launch" is a metric. Be specific or do not bother.
A Faster Way to Get Started
Templates beat blank pages. Use a free PRD generator — fill in the structured fields, get a clean Markdown document with the standard sections, and paste the result into your wiki, your repo, or a pull request description. The structure forces discipline; the live preview shortens the feedback loop. Once the format is muscle memory, the writing gets faster every time.