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A practical guide for agencies on what accessibility evidence to provide, how to document WCAG outcomes, and avoid delivery disputes.
Accessibility delivery often falls apart not at design or development, but at evidence.
Agencies can design and build with accessibility in mind, fix known issues, and still find themselves stuck at the same question near the end of a project:
“How do we prove this is accessible?”
This is where confidence wobbles, approvals stall, and delivery risk appears. Not because the work hasn’t been done, but because the evidence isn’t clear, structured, or defensible.
This guide explains what good accessibility evidence actually looks like in agency delivery, why teams commonly get stuck, and how to avoid the most common mistakes.
Accessibility evidence begins long before final testing; it starts with clarity on scoping and expectations. Using design-stage accessibility guidance helps align teams early on what evidence will be collected and how it will be used.
Most agencies don’t struggle to do accessibility work. They struggle to document it properly.
Common reasons include:
Clients don’t want technical dumps.
Developers don’t want vague statements.
Agencies need evidence that supports delivery decisions.
When clients ask for accessibility evidence, they’re rarely asking for:
They want reassurance that:
Good evidence answers those concerns clearly — without overreaching.
Automated results alone don’t demonstrate real usability or conformance.
Accessibility audits are evidence tools, not pass/fail badges.
Fixing issues and proving they’ve been fixed are not the same thing.
Statements like “fully compliant” or “100% accessible” create unnecessary risk.
Strong accessibility evidence is structured, scoped, and transparent.
Every accessibility evidence pack should start with clarity.
It should define:
Without scope, evidence loses credibility.
Evidence should clearly show:
This is the core output of WCAG conformance audits — translating findings into something teams can act on.
Good evidence distinguishes between: