There are two types of projects that go off the rails: those with no scoping at all, and those whose brief is so exhaustive it no longer bears any resemblance to reality after three weeks.
A good technical brief isn't an 80-page document. It's a shared working tool that lets your team — internal or external — understand what's being built, why, and how you'll know it succeeded.
Why most briefs are useless
Three patterns come up every time.
The first: it describes solutions, not problems. Features are listed without explaining the underlying need. The result: the provider delivers exactly what was written, but it's not what the user actually needed.
The second: it's too rigid. A brief that claims to anticipate everything is a document that becomes obsolete the moment it meets reality. Product development is iterative. The framing must be too.
The third: it isn't read. An 80-page document takes three weeks to produce and gets skimmed. It's not a brief — it's a guarantee of misunderstanding.
What a good technical brief must contain
1) Context and business objectives
This is the most important section — and the most frequently missing. Before describing what to build, explain why.
- What problem does this product solve?
- For whom exactly (a precise persona, not just "users")?
- What's the expected outcome at 3 and 6 months?
- What's the primary success criterion?
This section enables any team member to make a coherent decision without consulting you at every fork in the road.
2) Priority user journeys
Describe the critical flows as scenarios, not feature lists.
Example:
"A user lands on the homepage, signs up with their email, completes their profile in 3 steps, then accesses the main dashboard. They can then create their first project in under 2 minutes."
This format is far more useful than a checklist because it puts the developer in the user's shoes. It also immediately surfaces the structurally important technical decisions: authentication, onboarding, roles, state management.
3) Non-negotiable technical constraints
These aren't desirable constraints — they're the ones that genuinely condition the architecture:
- existing stack to respect or integrate with
- imposed hosting (sovereign cloud, on-premise)
- regulatory compliance (GDPR, HIPAA, PCI-DSS)
- SLA or availability requirements
- mandatory integrations with existing systems
Everything not listed here is a freedom left to the technical team — and that's often exactly right.
4) The V1 scope — and what's explicitly out of scope
This is one of the most useful sections: what you're not building.
Explicitly listing features excluded from the first version avoids the most expensive misunderstandings. "We don't handle push notifications in this version" or "multi-language support is out of V1 scope" are sentences that save weeks.
| In V1 | Out of V1 |
|---|---|
| Sign-up and login | Social login |
| Project creation | Project sharing with third parties |
| Basic dashboard | Advanced reporting and exports |
| Monthly subscription payment | Annual billing and promo codes |
5) Acceptance criteria
For each key feature or main journey, define how you'll know it's complete and correct.
An acceptance criterion is a concrete, testable sentence:
- "A user can sign up with a valid email in fewer than 3 clicks."
- "A confirmation email is sent within 30 seconds of sign-up."
- "In case of login error, a clear message is displayed without redirection."
These criteria protect both parties: they prevent disputes over "is it delivered or not" and provide a shared basis for quality checks.
What doesn't belong in a technical brief
Implementation details
"Use PostgreSQL with indexes on user_id and created_at columns" has no place in a technical brief unless you have a hard technical constraint. These decisions belong to the technical team — that's why you're hiring them.
Final mockups
Mockups are a design deliverable, not a brief. Including them prematurely creates two problems: they lock in UX decisions before the journeys have been validated, and they create the impression that design work is done when it hasn't been properly thought through yet.
Schematic wireframes are sufficient at this stage, if anything. Our UX prototyping service exists precisely to validate journeys before development begins.
"Just in case" features
Every feature in the brief ends up in the quote. Every feature in the quote ends up in the backlog. Every feature in the backlog is a prioritisation decision you'll have to manage.
Be ruthless in your selection: if it's not needed to validate your initial hypothesis, it's out of scope.
The right format for your situation
For an MVP with an agency or freelancer
A 5 to 10-page document is more than enough:
- context and objectives (1 page)
- 3 to 5 critical user journeys (2–3 pages)
- technical constraints (1 page)
- V1 scope + out of scope (1 page)
- acceptance criteria per journey (2–3 pages)
For a more structured project or an internal team
You can go deeper on target architecture, SLAs, integrations, and governance. But even then, keep the document alive: a brief is a starting point, not a contract.
For projects with regulatory or contractual constraints
Some contexts (healthcare, finance, public procurement) require a more formalised brief. In those cases, clearly separate the contractual document from the working document — the first protects, the second guides.
What teams that consistently ship do differently
They don't try to anticipate everything. They try to align everyone on priorities and intentions.
Their brief answers three questions, clearly:
- What problem are we solving, for whom, and how do we measure success?
- What are we building in this version, and what are we not building?
- How do we know it's done?
The rest is detail that can evolve along the way — and that's exactly as it should be.
"A good brief doesn't predict the future. It prevents avoidable misunderstandings."
How to get started concretely
If you're starting from scratch, here's the sequence that works:
- Write your business objectives first — two or three sentences. If you can't articulate them clearly, the rest of the document will be fuzzy.
- List your 3 to 5 critical journeys as narrative scenarios.
- Have it reviewed by someone who doesn't know the project — if they can't understand what's being built and for whom, start over.
- Explicitly define what's out of scope — this is often the most valuable conversation to have with your team.
- Add acceptance criteria at sprint framing time, not in the initial document.
Our product framing service supports this step for teams who want to structure their project before development begins.