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Common failures (was: Common failures and baseline)

From: Johannes Koch <koch@w3development.de>
Date: Tue, 23 May 2006 10:42:48 +0200
Message-ID: <4472CB08.8060308@w3development.de>
To: w3c-wai-gl@w3.org

> Johannes Koch wrote:
> So the baseline has an influence on the "sufficiency" of a _technique_ to
> _pass_ a SC, but it has no influence on the "sufficiency" of a _failure_ to
> _fail_ a SC?

Gregg Vanderheiden wrote:
> GV: NO.  THAT IS NOT WHAT THE SENTENCE ABOVE SAYS. READ THE LAST SENTENCE. 

Let me rephrase my question. The WCAG WG lists some common failures with 
references to the success criteria they are related to. Some author 
writes content in a way described in one of the common failures. Does 
this content fail the related success criteria? Are there any additional 
conditions?

Another point: I think the common failures are expected not to interfere 
with sufficient techniques. So for any part of content and any success 
criterion there cannot be a sufficient technique for which the testing 
procedure results in true and a common failure for which the failure 
condition applies.

In a reply to Tim Boland (May 8, 2006; Message-ID: 
<002701c672a7$85b9d090$ee8cfea9@NC6000BAK>; Subject: RE: Technique 
Designations) you wrote:

<blockquote>
   If they use another technique, then the burden of proof is on them
   should someone ask. It is not a better or worse technique for meeting
   the success criterion. It is just not identified by the working group
   as a technique that is sufficient so it doesn't have that face
   validity.
</blockquote>

So if someone chooses a technique not listed as sufficient in the 
"Understanding WCAG 2.0" document, but which he thinks to be sufficient, 
the technique must not interfere with a listed common failure. Or the 
other way round: If a tester creates a test methodology based on but 
exceeding the listed sufficient techniques and common failures, and 
creates a test procedure for content that he thinks would fail a success 
criterion, this not-listed "common failure" must not interfere with a 
listed sufficient technique.
-- 
Johannes Koch
In te domine speravi; non confundar in aeternum.
                             (Te Deum, 4th cent.)
Received on Tuesday, 23 May 2006 09:44:03 GMT

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