Yes
Linda Burkhart works with people with more cognitive difficulties
(although they are still more able than most of the pupils I have daily
contact with).
Although some of her techniques could be used to develop and teach
scanning skills (and the skills certainly do need to be taught), and her
approach is excellent
And I think you are right to highlight the different operations in
scanning between different devices: scanning communication aids, and
scanning wheelchair drives.
Paul Nisbet from the Edinburgh call centre
(http://callcentre.education.ed.ac.uk/) has written some stuff on switch
scanning,
as has David Colven from the Ace centre.
There was also a very interesting article by Colin Clayton (I think)
looking at some of pre-requisite skills required for
successful scanning to effectively access assistive technology.
Richard Walter
Meldreth Manor School
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