Maturity models
Accessibility maturity models help organisations see where they stand and follow their progress over time. They usually describe a range from unplanned and random at the low end to constant improvement and new ideas at the top.
Key point
No one maturity model is the official standard. The W3C, the Business Disability Forum and Carnegie Mellon’s version of the Capability Maturity Model all provide different frameworks. The right model depends on an organisation's context. What matters is using one consistently rather than which one is chosen.