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?
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?
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.