Stop 05 · Requirements & DocumentationTopics · 1/9

Writing a PRD (Product Requirements Doc)

In short

A PRD is where a fuzzy idea becomes something a team can build. Done well, it saves weeks of "wait, what were we making again?" conversations.

A structured document describing the problem, goals, success metrics, scope, and requirements for a feature — the artifact that aligns design, engineering and stakeholders before work starts.

The purple blob in a hard hat unrolls a large blueprint at a building site.

Think of it like this

The architect's blueprint

Before a single brick is laid, the architect's blueprint shows rooms, sizes and where the pipes go. Masons, electricians and plumbers all read the same sheet. A PRD is that blueprint for designers, engineers and testers.

Watch it happen

What goes inside a PRD

PRD

Why

What

Problem

Goals & metrics

Users & stories

Scope in / out

Open questions

1/5A PRD answers two big questions: why are we doing this, and what exactly are we building?

The big ideas

What you need to know

Problem before solution

Spend the first section on the problem. If readers aren't convinced it matters, the rest won't land.

Say what's out of scope

Listing what you won't build stops scope creep and endless "can we also add…" requests.

Written with the team

Share early drafts with design and engineering. Their questions make the PRD stronger.

A living document

Update it as decisions change, with a short changelog at the top.

Save yourself the pain

Common mistakes

Oops

Writing a 30-page PRD that specifies every pixel.

Do this instead

Keep it as short as possible. Leave design details to designers and link to their files.

Oops

Handing over the PRD and disappearing.

Do this instead

Walk the team through it, answer questions and keep it updated during the build.

Your mission

Outline a PRD

~30 min

Quick check

Why should a PRD list what is out of scope?

Go deeper

1Find 2-3 public PRD templates and compare their structure.
2Write a full PRD for a small, real feature idea (see the phase project).
3Learn to separate 'must-have' scope from 'nice-to-have' scope explicitly in the doc.