- Studios reject briefs that lack specificity: vague scope leads to disagreements, missed deadlines, and cost overruns that kill projects before they start.
- A requirements document must cover functional behavior (what the system does), non-functional qualities (speed, security, reliability), user flows, and explicit priority labels (must-have vs. nice-to-have).
- Unspoken assumptions—about user accounts, API readiness, integrations, or dependencies—are the hidden cost of unclear briefs; name them directly to anchor expectations and get realistic timelines.
What a Technical Requirements Document Actually Is
A technical requirements document (also called a requirements specification or brief) is a written agreement between you and a studio about how your software should function, what it must deliver, and what constraints or dependencies exist. Software requirements specifications establish the basis for an agreement between customers and contractors on how software should function, and reduce later redesign.
The key word is written. Developers cannot build an idea that exists only in conversation; they require structure including a written product outline, list of essential features, and basic user flow diagrams. A studio that quotes you a price without asking for this document is not doing discovery—they're guessing.
Why Studios Reject Unclear Briefs
Hiring a developer before clarifying core use case, user flow, and constraints is one of the most common and expensive mistakes founders make. When a brief is vague, studios either walk away or quote inflated prices to hedge their risk.
Here's what happens: You send a two-page brief. The studio builds it. Halfway through, you realize you meant something different. The studio rebuilds it. You disagree on what "done" looks like. The project balloons to three times the original estimate. Everyone loses.
Studios that say no to vague briefs are protecting themselves and, indirectly, you. A single lump-sum price with no breakdown usually means the vendor hasn't taken time to understand your goals or project details.
What to Include: The Core Sections
Introduction and Scope
A requirements introduction should define document purpose, product scope, intended audience, and key terms that shape the specification. Start by answering these plainly:
- What is this product for? (One sentence.)
- Who will use it?
- What problem does it solve?
- What is explicitly not included in this build?
Example: "We are building a mobile app for restaurant managers to track daily inventory. Initial users are small chains with 2–10 locations. This brief covers iOS only; Android comes in Phase 2. We are not building a supplier ordering system in this phase."
Functional Requirements
Functional requirements capture actions and system responses. This is the meat of the document. For each major feature, write:
- What the user does (action)
- What the system shows or does in response
- What happens if something goes wrong (error states)
Bad: "Users can manage inventory."
Good: "A manager logs in with email and password. They see a dashboard showing current stock for all items. They click 'Add Item' and enter item name, SKU, quantity, reorder level, and cost. The system saves the item and shows a confirmation. If they enter a duplicate SKU, the system rejects it and shows the error message 'SKU already exists.'"
Be this specific for every major feature. When reviewing the feature list or statement of work, look for specificity; if the agency lists "User Profile" with a 40-hour estimate, ask them to define what that actually includes.
Non-Functional Requirements
Non-functional requirements capture qualities such as performance, reliability, security, usability, portability, and maintainability. These matter as much as features:
- Performance: "The inventory dashboard must load in under 2 seconds on 4G."
- Security: "Passwords must be hashed. Managers can only see data for their own locations."
- Reliability: "The app must stay online 99.5% of the time. Offline mode should cache the last 100 items."
- Compliance: "Must comply with GDPR and PCI-DSS if payment data is stored."
Studios need these constraints to choose the right architecture and tech stack.
User Flows and Wireframes
A simple diagram showing how a user moves through the product is worth a thousand words. You don't need Figma—even a text outline or rough sketch works:
"Manager opens app → Sees dashboard with location picker → Selects location → Sees inventory list → Clicks item → Views details and edit option → Updates quantity → Saves → Sees confirmation."
Include edge cases: "What if a manager has access to only one location? Skip the picker and go straight to inventory."
Feature Priorities
| Feature | Priority | Why |
|---|---|---|
| Login | Must-have | Without it, no access control |
| Add/edit items | Must-have | Core workflow |
| Reorder alerts | Should-have | Improves UX but not required for MVP |
| Barcode scanning | Future enhancement | Nice feature, can add later |
This tells the studio where to focus and what can be cut if budget becomes tight.
Integrations and Dependencies
List any external systems the app must connect to:
- Payment processor (Stripe, Square)
- Email service (SendGrid)
- Third-party APIs and their current status (ready, in development, not yet approved)
- Data sources (spreadsheets, existing databases)
The studio needs to know: Are these APIs live? Do you have credentials? Who owns the integration work?
How to Kill Vague Language
Replace Outcomes with Actions
Vague: "Users can easily manage their accounts."
Specific: "Users can reset their password via email link sent within 5 minutes. Users can update their name, email, and location in Account Settings. They cannot change their username once created."
Define What "Done" Means
Instead of "Dashboard," say: "Dashboard includes: location picker dropdown, inventory summary card (total items, low-stock count), list view of all items sortable by name/SKU/quantity, and one-click edit access to each item."
Spell Out Assumptions
List them explicitly:
- Users already have email addresses on file.
- The payment API will be live by week 4 of development.
- We will provide a production database; the studio will not set up hosting.
- Changes to the design after launch are out of scope.
- The studio handles security audits; we cover penetration testing separately.
These aren't buried in a footnote—they're in a dedicated section.
Why Studios Want to See This
A team that quotes a fixed price without wanting to do discovery work is guessing; discovery typically takes 1-2 weeks and results in a detailed technical spec. A studio that takes discovery seriously will ask for (or create with you) a document like this before quoting.
Why? Because specificity reduces risk. A clear brief means:
- The studio can scope accurately and give you a real timeline.
- Disputes about what was included disappear.
- Testing and acceptance criteria are already defined.
- Change requests are obvious and priced separately.
- The team can plan resource allocation and dependencies upfront.
A studio that skips this step and gives you a lump-sum quote is either very confident or cutting corners. Most are cutting corners.
What About AI or Complex Products?
For AI-powered products, add:
- What the AI should do (predict, classify, generate, rank)
- Input data: what it receives and in what format
- Output data: what it returns and how the app displays it
- Accuracy or performance expectations (if any)
- Training data: where it comes from, how fresh it needs to be
- Fallback behavior: what happens if the AI fails or is unavailable
For multi-phase products, break each phase into its own requirements section and mark clearly which features launch when.
How Studios Use This to Quote
When you send a clear requirements document, a studio will:
- Spend 1–2 weeks doing discovery and technical analysis (talking to you, sketching architecture, identifying risks)
- Break the work into specific tasks (e.g., "Login page with email/password validation: 16 hours")
- Identify blockers or assumptions that need clarification
- Propose a fixed-price contract or phased approach with clear milestones
- Give you a timeline that includes a buffer for testing and revision
This is the right path. Studios that skip step 1 and jump straight to a price are saving time—but at your expense.
Red Flags in Your Own Brief
Before you send it, ask yourself:
- Can someone who has never heard of my product build it from this document alone?
- Have I explained why each feature matters?
- Have I said what is definitely NOT in scope?
- Have I listed every third-party system we're connecting to?
- Does each feature have a priority level?
- Have I described what happens when something breaks or is missing?
If you answer no to any of these, the document needs more work before you send it to studios.
How Authect Approaches This
When you contact Authect, we don't quote from a quick email. We do discovery first. We ask questions, sketch flows, and identify constraints. Then we write a technical spec—either with you or for you—so both sides know exactly what's being built. That's how we deliver scoped, fixed-price projects without surprises.
FAQ
Do I need to include wireframes or just descriptions?
Descriptions are enough for a requirements document. Wireframes (or rough sketches) help clarify complex layouts, but they're not mandatory. A studio will create detailed UI designs after the requirements are approved. Focus on describing what the user sees and does, not pixel-perfect visuals.
What if I'm not sure about some requirements?
Mark them as "To be confirmed" or "TBD" and call out the risk. For example: "User reporting feature—nice-to-have, depends on database performance." The studio will help you decide during discovery and flag where guessing could cause delays.
How long should a requirements document be?
Anywhere from 2,000 to 5,000 words, depending on product complexity. A simple landing page might be one page. A full platform with integrations, user roles, and reporting could be 10–15 pages. Better too detailed than too vague.
Who should write this—me or the studio?
Ideally, you draft it (you know your business), then iterate with the studio (they know what's buildable and what creates technical risk). Some studios offer discovery as a paid phase. That's normal and worth the investment—it prevents expensive mistakes later.
