PRD Writing Guide: Structure and Steps
A product requirements document (PRD) is the artifact used in product development to communicate what capabilities must be included in a release to the development and testing teams. ProductPlan notes that the PRD is typically used in waterfall environments, but it may be used in an agile setting as well. It does not dictate a specific implementation; it is firmly rooted in use cases and desired functionality.
PRD vs. MRD
An MRD (market requirements document) addresses market opportunity and business case — customer demand, market opportunity, and why the product or a particular release is worth building. The PRD does not touch on market opportunity or revenue; it focuses only on use cases and desired functionality. Each feature or capability is usually described as a separate item with an accompanying use case. Based on the PRD, engineering writes a functional specification (how each item will be implemented) and an architectural design document, UX creates wireframes and mockups, and QA writes a test plan covering every use case.
In short: the MRD explains why to build it; the PRD explains what to build.
What a PRD should contain
A complete PRD typically includes these sections:
- Objective / Goal: explain why you are building this and what you hope to accomplish.
- Features: each feature needs at least a description, goal and use case. Complex features may be broken into sub-items, each with its own use case where relevant. Out-of-scope items can be listed too.
- UX Flow & Design Notes: not pixel-perfect mockups at this stage, but a description of the overall user workflow to ensure release objectives are met.
- System & Environment Requirements: which end-user environments will be supported, such as browsers, operating systems, memory and processing power.
- Assumptions, Constraints & Dependencies: assumptions are what you expect to be in place but is not guaranteed (e.g., all users have internet connectivity); constraints are limits the implementation cannot exceed (budgetary or technical); dependencies are outside elements the final solution relies on (e.g., depending on Google Maps for directions).
Steps in creating a PRD
Assuming an MRD already exists, ProductPlan suggests the following sequence:
- Align with product marketing on the business drivers behind the specific release.
- Determine scope using whatever product prioritization methods the team already uses.
- Author the document, drawing on notes and user feedback captured for each feature.
- Review in rounds with the rest of the product team to answer as many potential questions as possible.
- Confirm with business stakeholders that they align with the release objective and the features included.
- Hand off to engineering, where questions and challenges are addressed verbally and reflected in the PRD — the goal is no surprises later.
- Pass to downstream teams for UX design, functional specifications and test plan definition.
By including all these teams in the creation and review process, everyone gets on board with what will be shipped, how it benefits the business, and its impact on users.
What a PRD skeleton looks like
Rather than agonizing over templates, look at a skeleton that can actually ship. Here is one for "add an export feature to the admin":
Goal: let operations export order data for any time range within 10 minutes
Feature: order export
Description: export CSV/Excel based on filters, 50,000-row cap
Use case: ops selects paid orders from 6/1-6/30 → clicks export → background job generates → email + in-app notification with download link
Out of scope: custom report templates, scheduled auto-export
System requirements: last two major versions of Chrome/Safari; CSV in UTF-8 with BOM (avoids Excel mojibake)
Assumptions: fewer than 1M order rows; Dependency: object storage available
Constraint: export must finish within 3 minutes or time out
The more specific the use case, the easier QA can write tests and engineers can estimate. The vague phrase "support export" is the most common trap in a PRD.
A post-mortem of a failed PRD
A team wrote a PRD for a "member points" feature that only said "users can earn points and redeem them." Engineering implemented "points can offset any product", but after launch operations revealed the rule was "only certain products", costing two more weeks of rework. The retrospective found the PRD had no "out of scope" section and no points-expiry policy. Those two lines, written clearly at the time, would have saved two weeks.
The lesson: out-of-scope items and boundary conditions (expiry, caps, negatives) are the parts a PRD most easily misses — and the most valuable.
Questions to ask in review
When reviewing a PRD, run through these questions one by one:
- Does every feature have a use case? If not, why are we building it?
- What is explicitly out of scope? Are boundary conditions (caps, expiry, exceptions) covered?
- Who owns each dependency? Should any assumption be promoted to a formal requirement?
Where the PRD stands in the AI era
Mind the Product has argued that in the AI era a static PRD can no longer do the work of a spec on its own — "what good looks like" needs a runnable evaluation set. But for most websites and business applications, the PRD remains a reliable carrier of goals, boundaries and use cases. Combining the PRD's "why and for whom" with an eval set's "what" is the most pragmatic approach. When scoping, it also helps to check the Tech Stack Evaluation Guide so functional requirements and implementation align at the project stage.
16IDC perspective
For site-building and SaaS teams, the core value of a PRD is reaching agreement on "what to build" before you start building. It does not need to be long, but goals, features, use cases, system requirements, and assumptions/constraints should not be missing — and it must go through several review rounds. For the full analysis workflow, see the Requirements Analysis category on this site.
Source: https://www.productplan.com/learn/product-requirements-document/
Reference: Atlassian's PRD guide https://www.atlassian.com/agile/product-management/product-requirements-document