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RE: EvalTF Size of Sample

From: Kathy Wahlbin <kathy@interactiveaccessibility.com>
Date: Wed, 4 Jan 2012 09:44:35 -0500
To: "'Velleman, Eric'" <evelleman@bartimeus.nl>, <public-wai-evaltf@w3.org>
Message-ID: <003001cccaef$6200dd00$26029700$@interactiveaccessibility.com>
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? 


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-----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 Velleman
Technisch directeur
Stichting Accessibility
Universiteit Twente

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Received on Wednesday, 4 January 2012 14:45:04 UTC

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