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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:

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 

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:

   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

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 UTC

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