Benjamin - Some comments below. I hope these help.
Regards, William Hudson Syntagm Ltd Design for Usability UK 01235-522859 World +44-1235-522859 US Toll Free 1-866-SYNTAGM mailto:[email protected] http://www.syntagm.co.uk skype:williamhudsonskype Syntagm is a limited company registered in England and Wales (1985). Registered number: 1895345. Registered office: 10 Oxford Road, Abingdon OX14 2DS. > -----Original Message----- > From: [email protected] [mailto:discuss- > [email protected]] On Behalf Of Benjamin Davies > Sent: 28 October 2009 9:37 AM > To: [email protected] > Subject: [IxDA Discuss] Success criteria for accessability testing > > Hello. I am about to begin designing a usability study on a government > website and evaluating the accessability of the site will be a big > component. I'm looking for advice on comparing data from the > visually disabled participants (using screen readers and magnifieers) > to participants with typical vision. > > 1. Is there an expected relationship between typical participants and > the visually disabled (ie, is it possible to say that "if the > disabled participants have time-on-task within 35% of non-disabled > participants the task is considered to not have accessability > problems"?) If so, what should be the percentage difference? No. Because of the massive difference between the 'parallel processing' that we take for granted when visually scanning a page and the serialization that is performed by screen readers, there is almost no correlation at all. Users with typical vision might find something trivially quick to do while disabled users may find it impossible. > 2. Should I create test tasks as I would normally and then adapt them > as necessary for the disabled or should I have some or all of the > tasks specifically designed for the disabled? I would suggest that the tasks should be based on common scenarios (user stories, use cases or whatever) for that site. If it's an important task, everyone should be able to do it. There *may* be some tasks specific to disabled users, but I would suspect these to be in the minority. > 3. Are there any common problems with installation and settings with > JAWS, Dragon Reader, and Zoomtext (the software we'll be using) I > have limited experience with them and while I plan to working with > them. I plan to spend a lot time with them in preparation for the > test but making sure I have the test environment propperly setup is a > worry that I'd like to remove. JAWS is pretty straightforward but advanced users may want to do some customization. I am not familiar with Dragon Reader. Do you mean Dragon Naturally Speaking? If so, the system needs some training for each user. Allow around 15-20 minutes for this and make sure you have a good quality headset microphone. (There are other solutions but a headset microphone is the most reliable for many purposes.) I don't know about Zoomtext. ________________________________________________________________ Welcome to the Interaction Design Association (IxDA)! To post to this list ....... [email protected] Unsubscribe ................ http://www.ixda.org/unsubscribe List Guidelines ............ http://www.ixda.org/guidelines List Help .................. http://www.ixda.org/help
