The product requirements document (PRD) is one of the most misunderstood artefacts in software development. Many founders think of it as a bureaucratic formality. Something large companies do because they have to, not something an early-stage startup needs.
They are wrong. The PRD is the document that makes the difference between a developer building what you asked for and a developer building what you meant.
If you have ever received software that technically did what the specification said but was not what you wanted, you understand the problem a PRD solves.
What a PRD actually is
A PRD is a written document that describes what a software product or feature should do, who it is for, and how success will be measured. It is not a technical specification. It does not describe how the software works internally. It describes what the software needs to accomplish from the perspective of the user.
The distinction matters. A technical specification tells developers how to build something. A PRD tells them what to build and why. The how is the developer's job. The what and why are yours.
For early-stage founders without a product team, writing a PRD serves two purposes: it forces you to think clearly about what you actually want, and it gives developers a reference point for making the hundreds of small decisions they will encounter during development.
The structure that works
1. Problem statement
Start with the problem you are solving, not the solution. One paragraph that answers: who has this problem, what does the problem cost them, and why does it exist?
Good: "Freelance graphic designers spend two to three hours per week manually tracking which clients have paid outstanding invoices. This happens because invoicing tools built for agencies assume a team workflow, leaving solo freelancers with no lightweight option."
Bad: "We need an invoicing feature that lets freelancers send invoices and track payments."
The good version gives developers context that will inform dozens of micro-decisions. The bad version gives them a feature description without understanding.
2. User stories
Describe the product from the perspective of the user doing something specific. The format is: "As a [user type], I want to [do something] so that [benefit]."
Examples:
- "As a freelancer, I want to see all unpaid invoices in a single view so that I know who to follow up with."
- "As a freelancer, I want to send a payment reminder with one click so that I do not have to write a new email each time."
Keep each user story focused on one action. If a story covers multiple things, split it.
3. Scope
Be explicit about what is included in this version and what is not.
In scope: send invoice via email, track paid/unpaid status, one-click payment reminder.
Out of scope: recurring invoices, invoice templates, client login portal, payment processing (Stripe integration is V2), multi-currency support.
The out-of-scope list is as important as the in-scope list. It is where you capture every idea you have that is not the current priority, which prevents scope creep by giving those ideas a legitimate home.
4. Acceptance criteria
For each feature, describe the specific conditions that must be true for the feature to be considered complete.
"Invoice tracking is complete when: a user can see all invoices with their status (paid/unpaid/overdue), filter by status, and click on any invoice to see the detail view."
Acceptance criteria turn subjective judgment calls ("is this done?") into objective tests ("does it meet the criteria?"). This is the mechanism that prevents end-of-project disputes about whether work is complete.
5. Non-functional requirements
These are requirements that are not about specific features but about the overall behaviour of the system:
- Performance: "The invoice list should load in under two seconds for a user with up to 500 invoices"
- Security: "Invoice data must be accessible only to the account holder"
- Accessibility: "The product should be usable with keyboard navigation only"
- Supported devices: "Mobile-responsive, tested on iOS Safari and Android Chrome"
Most first-time founders omit non-functional requirements entirely and then are surprised when the delivered product is slow, breaks on mobile, or has security gaps.
6. Success metrics
How will you know if this feature is working? Define it in advance.
"The invoice tracking feature is successful when: 60% of users who create an invoice also use the payment reminder feature within 30 days of launching."
Success metrics force you to think about behaviour change, not just feature delivery. A feature can be technically complete and still be a failure if users never use it.
Common mistakes when writing PRDs
Too long and too detailed. A PRD for a single feature should fit on two to four pages. A PRD that is twenty pages long will not be read. Write enough to be clear, not enough to be comprehensive.
Describing the UI in too much detail. The PRD describes what the product needs to accomplish, not what every button looks like. Leave UI decisions to the designer unless you have a strong specific requirement.
No priority ordering. If the PRD contains a list of requirements, prioritise them. Not everything is equally important. When development runs over time (and it always does), you need a clear record of what to cut and what to keep.
Changing the PRD during development. A PRD is a baseline. Changes during development are legitimate but should be tracked as amendments, not silent overwrites of the original document. This preserves the record of what was originally agreed.
No owner. Someone has to be accountable for answering developer questions during the build. Name that person explicitly in the PRD.
A template to start with
If you want to get a PRD written quickly, here is the minimum viable structure:
- Background (two sentences): what problem and who has it
- Goals: what this product will accomplish
- Non-goals: what this product will not do
- User stories (five to ten): the specific things users will do
- Acceptance criteria: the test for each user story
- Open questions: things you need to decide before build starts
Write it in plain language. Technical jargon is not a sign of rigor. Clear prose is.
Using a PRD with an external development team
If you are working with an offshore or external development team, the PRD is even more important. Without it, each developer interprets the requirements through their own assumptions, which are often wrong.
A development team that asks for a PRD before starting work is a sign of a professional team. One that starts building without one is a warning sign.
Our teams always run a discovery phase before development begins. If you arrive without a PRD, the discovery phase produces one. If you arrive with a PRD already written, discovery refines and pressure-tests it.
Before you get to any of that, use the MVP planner to think through the scope of your first version. It will surface the questions you need to answer before anyone writes a line of code.