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Re: Levels of Conformance discussed on April 10, April 17, 2020

From: David MacDonald <david100@sympatico.ca>
Date: Thu, 23 Apr 2020 12:19:19 -0400
Message-ID: <CAAdDpDZngq_ETsWwDu132XiJK9OyYajCDhbVmeSF9-ewcRc3KQ@mail.gmail.com>
To: Alastair Campbell <acampbell@nomensa.com>
Cc: Silver Task Force <public-silver@w3.org>
I agree that we can decide on the exact number of categories later and that
to fly the concept that we work with 4 or 5. The main point is can we
proceed with this model.

I'm attracted to the model as presented by Bruce (and elaborated on by
David F. here) rather than the % model which could come up with numbers
like 79% and very little likelihood of inter rater reliability.

David MacDonald

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On Thu, Apr 23, 2020 at 11:25 AM Alastair Campbell <acampbell@nomensa.com>

> > About 3 – 5 levels: Likert scales (a common usability metric) usually
> consist of 5 points. This would keep Silver consistent with already
> accepted norms.
> If we are asking people to evaluate something on a scale then the main
> thing is: How easy is it to evaluate the thing and match it to a point on
> the scale?
> Likert is generally used on opinion based thing (an agree-disagree scale),
> what we are asking people to do is a bit different. If there are obviously
> discrete categories that work for the guideline, then fit the number of
> options to those categories for each guideline.
> It might best be 3 for some things, 7 for others. I don’t think it is
> worth getting stuck on that at this stage.
> I suggest defaulting to 4 or 5, and seeing how that works across the
> guidelines.
> -Alastair
Received on Thursday, 23 April 2020 16:19:48 UTC

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