Research papers related to Challenges of Conformance

While looking for another paper (Giorgio Brajnik's Barrier Walkthrough 
<https://users.dimi.uniud.it/~giorgio.brajnik/projects/bw/bw.html>) I 
ran across some research papers on Conformance that I haven't looked at 
in a long time. Some are related to some of the issues we are discussing 
in the Conformance subgroup.

In 2011, W3C WAI hosted a Web Accessibility Metrics Symposium. The 
papers and slide 
<https://www.w3.org/WAI/RD/2011/metrics/proceedings.html>s from the 
presentations are still available on the W3C  WAI site.  I was 
particularly interested in "A Template-aware Web Accessibility metric 
<https://www.w3.org/WAI/RD/2011/metrics/paper3/>".

It was a good reminder that many people have been thinking deeply about 
conformance for a long time and we should look at their work.  I would 
be interested in reading newer research as well. If anyone has links to 
relevant papers, please share them.

jeanne