A business requirements document (BRD) exists to answer one question clearly enough that engineering, design, and stakeholders can all build the same thing: what does the business actually need, and why? Most BRDs fail not because they're missing sections, but because they describe solutions instead of requirements — telling the team what to build before anyone has agreed on what problem it's solving.
What a BRD Is (and Isn't)
A BRD documents the business need, not the technical solution. It's written before a technical design document, not after — if your BRD reads like a spec for how a feature will be built, you've skipped a step. The BRD answers "what problem are we solving and what does success look like," while the technical spec that follows answers "how will we build it."
What to Include in a Business Requirements Document
- Executive summary — a one-paragraph description of the business problem and proposed initiative.
- Business objectives — the specific, measurable outcomes this project needs to achieve.
- Scope — explicitly what's in scope and, just as importantly, what's out of scope.
- Stakeholders — who's affected, who needs to approve, and who owns the final decision if priorities conflict.
- Functional requirements — what the system needs to do, described from a business/user perspective, not a technical one.
- Non-functional requirements — performance, security, compliance, and availability expectations.
- Assumptions & constraints — budget, timeline, and dependency constraints that shape what's realistic.
- Success metrics — how you'll know, after launch, whether this actually solved the problem.
The Most Common BRD Mistake: Writing Solutions, Not Requirements
"Add a dropdown filter to the reports page" is a solution. "Users need to narrow reports by date range because they currently export to Excel to do this manually" is a requirement. The second version gives engineering room to propose the best implementation — maybe a dropdown, maybe a date picker, maybe something else entirely — while still being unambiguous about what problem is being solved. Writing solutions instead of requirements is the single most common reason BRDs get rewritten mid-project.
“If your BRD tells engineers exactly what UI component to build, you've written a spec, not a requirements document — and you've made every future tradeoff decision for a team that hasn't seen the constraints yet.”
A Simple BRD Template
For most mid-size projects, a lightweight BRD covering the eight sections above in 3-5 pages is more useful than a 40-page document nobody finishes reading. Keep functional requirements as a numbered list (so they can be referenced and tracked individually), and keep the success metrics section specific enough that you could actually check it against reality six months after launch.
Who Should Write and Approve the BRD
A business analyst typically drafts the BRD, but it should be reviewed by both the business stakeholder who owns the problem and a technical lead who can flag unrealistic assumptions before they become expensive mid-project surprises. Getting sign-off from both sides before development starts is what actually prevents scope disputes later — not the document's length.
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