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Re: do we want to omit the confidence property?

From: Shadi Abou-Zahra <shadi@w3.org>
Date: Tue, 26 Sep 2006 09:44:09 +0200
Message-ID: <4518DA49.5060208@w3.org>
To: Chris Ridpath <chris.ridpath@utoronto.ca>
Cc: public-wai-ert@w3.org

Hi Chris,

Chris Ridpath wrote:
> A test that checks if the alt text is appropriate for the image. Company 
> "ABC" may have an accessibility testing system that checks alt text 
> against a know list of good alt text. They know their company logo must 
> have alt text of "ABC company logo". If the company logo image does not 
> have this alt text then it fails the test with a high confidence. 
> Company XYZ checks the same file, finds the company logo image, and 
> fails it with a low confidence.

Aren't these actually different tests? (The test for company ABC is a refinement of the test for company XYZ but it is a new test in itself)

> However, I'm now thinking that our "cannot tell" result may do just as 
> well.
> In the example above the result from ABC company would be "fail". They 
> know for sure that the alt text is incorrect. The result from company 
> XYZ would be "cannot tell" because they don't know what the alt text 
> should be.

Yes, that is the current model.

> It still might be helpful to know how confident the "cannot tell" result 
> is but I can live without it.

How would you judge the confidence for such a test?


Shadi Abou-Zahra     Web Accessibility Specialist for Europe | 
Chair & Staff Contact for the Evaluation and Repair Tools WG | 
World Wide Web Consortium (W3C)           http://www.w3.org/ | 
Web Accessibility Initiative (WAI),   http://www.w3.org/WAI/ | 
WAI-TIES Project,                http://www.w3.org/WAI/TIES/ | 
Evaluation and Repair Tools WG,    http://www.w3.org/WAI/ER/ | 
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Received on Tuesday, 26 September 2006 07:44:15 UTC

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