Adding the definite article I missed just a minute ago.

conformance-challenges/index.html

@@ -36,7 +36,7 @@ <h2>Introduction</h2>
 	    <section class="introductory">
 	    <h3>Goals</h3>
 
-<p>The goals of this document are to catalog and characterize the challenges with accessibility guidelines conformance, and conformance verification.  We believe that a better understanding of the situations in which WCAG 2.x
+<p>The goals of this document are to catalog and characterize the challenges with accessibility guidelines conformance, and conformance verification.  We believe that a better understanding of the situations in which the WCAG 2.x
 conformance model may be difficult or impossible to apply, and the places where accessibility conformance verification scales poorly if at all, can lead to more effective conformance models and testing approaches in the future.</p>
 
 <p>It is important to recognize that the places where WCAG 2.x conformance applies poorly, and the places where conformance verification scales poorly, nonetheless remain important to achieving accessibility.  For example, while requiring human judgement to validate a page may not scale (the core of Challenge #1 below), absent that human judgement it may not be possible to deliver a fully accessible web page.  Similarly, while it may not be possible+to ensure that all 3rd party content is fully accessible (the subject of Challenge #3 below), absent review of that content by a human sufficiently versed in accessibility it may again not be possible to ensure that content