A useful requirements document does not prescribe a fashionable technology stack before the problem is understood. It explains who the website serves, what those people need to accomplish, which business outcomes matter and how the finished work will be accepted. That shared reference makes proposals comparable and gives scope changes a transparent process.
What this guide covers
Use this framework to define scope, translate journeys into testable requirements, set measurable quality expectations and agree ownership before design or development begins.
Begin with outcomes and scope boundaries
Start with the customer and business problems the website must solve. Record audiences, languages, content types, integrations and the release boundary before discussing implementation choices.
Convert journeys into functional requirements
Describe each capability as a user, a trigger and an expected outcome. Include failure and recovery behavior so the requirement can be tested rather than interpreted later.
- Map the critical discovery, enquiry and purchase journeys.
- Define required fields, validation and confirmation behavior.
- List the content staff must be able to edit safely.
Make exclusions and assumptions explicit
Content production, data migration and third-party setup are common sources of hidden effort. State what is not included and who supplies every dependency.
- Separate copy, photography and translation responsibilities.
- Record hosting, domain, license and transaction costs.
- Place future ideas in a clearly labeled later phase.
Define measurable quality requirements
Terms such as fast, secure and mobile-friendly need a test method, representative pages and an acceptance threshold. Distinguish field outcomes from controlled pre-launch checks.
Set a performance budget
Choose representative templates and state how images, fonts, scripts and third-party tags will be assessed. Preserve the device, network and cache conditions with each result.
- Name the URLs used for repeatable performance checks.
- Set budgets for page weight and third-party code.
- Track Core Web Vitals after real-user data becomes available.
Specify accessibility expectations
Name the intended WCAG version and conformance level, then include keyboard, focus, contrast, label and error-message checks in acceptance testing.
- Test every critical journey using only a keyboard.
- Verify text and interface contrast with appropriate tools.
- Confirm that assistive technology receives form errors.
Clarify ownership, security and operations
The brief should identify account owners, access boundaries, data flows and post-launch responsibilities. These decisions protect continuity when suppliers or team members change.
Keep business accounts under business control
Domain, hosting, analytics and advertising accounts should be owned by the client organization. Suppliers receive only the access needed for their work.
- List every account and the accountable owner.
- Use named users and secure credential sharing.
- Document personal data sent to external services.
Connect delivery to a maintenance model
Define who will monitor updates, certificates, backups, forms, integrations and security alerts after launch. Include escalation paths for high-impact failures.
- Set an update and regression-test cadence.
- Assign backup retention and restore-test ownership.
- Define incident contacts and response priorities.
Build an acceptance and change process
Visual approval alone cannot confirm redirects, forms, analytics or accessibility. Link every important requirement to an observable test, evidence and decision owner.
Create an acceptance matrix
Track the requirement, test URL, action, expected result, evidence, owner and status in one place. Failed checks should remain visible until retested.
- Test mobile and desktop journeys independently.
- Verify forms, redirects, canonicals and sitemap output.
- Record defects, fixes and final retest evidence.
Control changes without blocking useful ideas
Assess each new request for effort, dependencies and impact on agreed outcomes before implementation. Approved changes should update the shared scope baseline.
- Record the reason and priority for each request.
- Estimate schedule, cost and dependency effects.
- Keep a dated record of approved scope changes.
Primary sources
Platform features and policies change. Review the current primary documentation before implementation.