The Accessibility Guidelines Working Group (AGWG) has published Accessibility Conformance Testing (ACT) Rules Format 1.0 as a W3C Recommendation. This standard helps developers of automated testing tools and manual testing methodologies to write, share, and implement test rules. The test rules contribute to consistent testing for accessibility standards compliance. ACT is introduced in the ACT Overview. For more information and examples of organizations already using ACT, see the blog post: Calibrate Your Accessibility Evaluation With ACT.