[Jammo-ux-core] drag and drop study on N810

[Brendan Cassidy]

Hi Everyone,
 
This is just a mail to let you know about some results of a study we
carried out regarding drag and drop tasks using the N810 device. The
study produced a couple of guidelines for designing drag and drop
interfaces on mobile devices. We focussed on the size of the target that
is to be dragged onto. This was done because some of the scenarios
included drag and drop interactions. 
 
In summary we found error rates (in this case, when a child failed to
successfully drag an object onto a target) increased the most when
target size dropped below 50 pixels2 (px2). We also found children had
difficulties dragging objects smaller than 20px2 in a pilot study,
leading to frustration, and errors. 
 
Another important point was regarding feedback when the child had
placed the stylus on an object to be dragged, a number of errors were
made because a child had not realised the target was selected, and so
released the stylus. Clear feedback (E.g. colour change, or
change/animate object graphic) should be provided both when the stylus
has been placed on the object, and when the target area is entered.
 
I have attached a copy of the short paper reporting this study (I hope
I can send attachments to this list). For anyone who may not be familiar
with the Fitts’ law terminology in the paper, Amplitude (A) refers to
the distance between the object to be dragged and the target area. Width
(W) refers to the size of the target.
 
Cheers
Brendan
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://garage.maemo.org/pipermail/jammo-ux-core/attachments/20090311/111cc579/attachment-0001.htm 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: IDCPaper2009.pdf
Type: application/pdf
Size: 300713 bytes
Desc: not available
Url : http://garage.maemo.org/pipermail/jammo-ux-core/attachments/20090311/111cc579/attachment-0001.pdf