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Re: SC Level assignment in WCAG 2.0

From: David MacDonald <david100@sympatico.ca>
Date: Thu, 28 Feb 2019 06:08:14 -0500
Message-ID: <CAAdDpDbRgpkNLUp4h1PDmbVXeV-cVT42x=Uo8P7zMzaQJY_k4Q@mail.gmail.com>
To: Bruce Bailey <Bailey@access-board.gov>
Cc: Silver TF <public-silver@w3.org>
Two additional factors that went into the decision of what level to choose
were:

- Did it require AT? The Level A SCs generally didn't require a user to
purchase Assistive Technology (i.e. magnification)
- Did it impact the look or feel of the website, and cause redesign? Level
A generally doesn't require a change to the look or feel of the site.

We've always been careful not to create hard and fast rules about when
something was Level A or AA and have stuck with "The Success Criteria were
assigned to one of the three levels of conformance by the working group
after taking into consideration a wide range of interacting issues."

Cheers,
David MacDonald



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On Tue, Feb 26, 2019 at 10:59 AM Bruce Bailey <Bailey@access-board.gov>
wrote:

> On the call today it came up that, in the context of litigation, it was
> not clear enough to lawyers how success criteria were assigned to the
> different levels.
>
> The most authoritative explanation is from Understanding Level of
> Conformance:
> http://www.w3.org/TR/UNDERSTANDING-WCAG20/conformance.html#uc-levels-head
>
> See the five bullet list following these two sentences:
> The Success Criteria were assigned to one of the three levels of
> conformance by the working group after taking into consideration a wide
> range of interacting issues.  Some of the common factors evaluated when
> setting the level included...
>
> The assignment of levels was the subject of much discussion as the Working
> Group developed 2.1.  That consensus was posted in the wiki, please see:
>
> http://www.w3.org/WAI/GL/wiki/WCAG_2.1_Success_Criteria#Initial_Suggestion_for_Priority_Level
>
> As part of that effort, I did an analysis (that has *not* been fully
> vetted by the working group) of the 2.0 against the five bullet points
> mentioned above.  See the discussion tab of that page:
> http://www.w3.org/WAI/GL/wiki/Talk:WCAG_2.1_Success_Criteria
>
> What I found is that:
> WCAG 2.0 Level A SC (generally) are two-out-of-three for easy, essential,
> or invisible -- 21 of 25 Level A SC are characterized this way.
> WCAG 2.0 Level AAA SC (generally) are not possible for all content -- 21
> of 24 Level AAA SC are characterized this way.
> That leaves AA SC (generally) as the remainder.  The more detailed tally
> is at the bottom of that wiki page:
> http://www.w3.org/WAI/GL/wiki/WCAG_2.1_Success_Criteria#Observations
>
>
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Received on Thursday, 28 February 2019 11:08:47 UTC

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