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[Fwd: Re: do we want to omit the confidence property?]

From: Shadi Abou-Zahra <shadi@w3.org>
Date: Tue, 26 Sep 2006 09:14:13 +0200
Message-ID: <4518D345.2020307@w3.org>
To: public-wai-ert@w3.org

[forwarding to the list for others to comment]


-------- Original Message --------
Subject: Re: do we want to omit the confidence property?
Date: Mon, 25 Sep 2006 11:17:28 -0400
From: Chris Ridpath <chris.ridpath@utoronto.ca>
To: Shadi Abou-Zahra <shadi@w3.org>
References: <45179625.9050008@w3.org> <006701c6e0a9$f5c74550$e29a968e@WILDDOG> <4517EBF2.1060403@w3.org>

Shadi,

> The counter argument to this usage of the confidence value, is that it 
> should be part of the test description (rather than the result 
> description).
>
Different systems will implement the same test differently and may give 
different results. Here's an example of what I was thinking of...

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.

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.

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

Cheers,
Chris



----- Original Message ----- 
From: "Shadi Abou-Zahra" <shadi@w3.org>
To: "Chris Ridpath" <chris.ridpath@utoronto.ca>
Cc: <public-wai-ert@w3.org>
Sent: Monday, September 25, 2006 10:47 AM
Subject: Re: do we want to omit the confidence property?


> Hi Chris,
>
> The counter argument to this usage of the confidence value, is that it 
> should be part of the test description (rather than the result 
> description).
>
> Regards,
>  Shadi



-- 
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/ | 
2004, Route des Lucioles - 06560,  Sophia-Antipolis - France | 
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Received on Tuesday, 26 September 2006 07:14:18 GMT

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