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Re: EvalTF Size of Sample

From: Alistair Garrison <alistair.j.garrison@gmail.com>
Date: Thu, 5 Jan 2012 09:12:53 +0100
Message-Id: <AEF9DABB-AA2A-40A7-B6C6-FA9AF61BF1AF@gmail.com>
To: Eric Velleman <evelleman@bartimeus.nl>, Eval TF <public-wai-evaltf@w3.org>
Dear all, 

Firstly, as a person can define an alternative version for a page in a claim - would it not make sense to take their wishes into account and assess, where they have requested it, only the alternative version.  What would the point be of making a claim for the alternative otherwise... 

Secondly, I thought we had already discussed at length in our previous telecon the idea of using an automated approach for selecting content relevant to each technique - so we find all pages with video content when we want to assess techniques to do with video content, etc...  Eric said that he would make contact to discuss this approach further - and I would still love to chat to him about it.  You then include all pages referenced in the assessment (those you have used for examples etc...) to form the scope.  It is an easy approach which ensures you look at all relevant content, rather than just taking 25 pages which may or may not include that one video clip tucked away in the web site.

All the best 

Alistair 


On 4 Jan 2012, at 17:08, Velleman, Eric wrote:

> Hi Kathy,
> 
> This could be related to the barrier probability: would you find more if you look at more pages?
> We have to consider how comparable the results will be if we do not use what seems to be the minimum 25 pages.
> We will cover barrier probability in a later part of the Methodology.
> Kindest regards,
> 
> Eric
> 
> =========================
> Eric Velleman
> Technisch directeur
> Stichting Accessibility
> Universiteit Twente
> 
> Oudenoord 325,
> 3513EP Utrecht (The Netherlands);
> Tel: +31 (0)30 - 2398270
> www.accessibility.nl / www.wabcluster.org / www.econformance.eu /
> www.game-accessibility.com/ www.eaccessplus.eu
> 
> Lees onze disclaimer: www.accessibility.nl/algemeen/disclaimer
> Accessibility is Member van het W3C
> =========================
> 
> ________________________________________
> Van: Kathy Wahlbin [kathy@interactiveaccessibility.com]
> Verzonden: woensdag 4 januari 2012 15:44
> Aan: Velleman, Eric; public-wai-evaltf@w3.org
> Onderwerp: RE: EvalTF Size of Sample
> 
> Hi Eric -
> 
> I agree with you that the three sample lists should be included.  I think
> that the number of pages will vary based on the website purpose, size and
> functions.  It will be very difficult to say that you should evaluate at
> least 25 pages on every site.
> 
> That said, here are the questions that I have:
> 
> 1.  Should we consider defining the number of pages in a sample based
> different scenarios or types of websites?
> 
> 2.  To defined size, do we need to talk about the number of pages or could
> we define it like you have done with the three sample lists and let the
> evaluator determine from those lists how many pages should be reviewed?
> 
> Kathy
> 
> Phone:  978.443.0798
> Cell:  978.760.0682
> Fax:  978.560.1251
> KathyW@ia11y.com
> 
> 
> 
> NOTICE: This communication may contain privileged or other confidential
> information. If you are not the intended recipient, please reply to the
> sender indicating that fact and delete the copy you received. Thank you.
> 
> -----Original Message-----
> From: Velleman, Eric [mailto:evelleman@bartimeus.nl]
> Sent: Tuesday, January 03, 2012 6:15 PM
> To: public-wai-evaltf@w3.org
> Subject: EvalTF Size of Sample
> 
> Dear all,
> 
> We had a short discussion in our last telco about the size of a
> representative sample of a website.
> The discussion varied between 6 and 5000... How many pages should we have in
> a sample to be replicable and at the same time achievable in terms of time
> and money?
> 
> In the updated version of the Methodology that will be online in the coming
> days I added:
> - the three sample lists that should be included into an evaluation (core,
> task-based and random). If we just take one of every resource named there,
> we have at least 25 pages.
> 
> Kindest regards,
> 
> Eric
> 
> =========================
> Eric Velleman
> Technisch directeur
> Stichting Accessibility
> Universiteit Twente
> 
> Oudenoord 325,
> 3513EP Utrecht (The Netherlands);
> Tel: +31 (0)30 - 2398270
> www.accessibility.nl / www.wabcluster.org / www.econformance.eu /
> www.game-accessibility.com/ www.eaccessplus.eu
> 
> Lees onze disclaimer: www.accessibility.nl/algemeen/disclaimer
> Accessibility is Member van het W3C
> =========================
> 
> 
> 
> 
Received on Thursday, 5 January 2012 10:48:48 GMT

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