The project: We're designing software that users will use all day long to perform 12 repetitive tasks. Each task has many steps and takes place in a different pane in the GUI. Some of the GUI is tabbed. There may also be commands on ribbon-like galleys, similar to the large drop-down menus in newer versions of Microsoft Office.]
My question: what research is there that shows the performance benefit of keyboard navigation in groups of users who become expert users in a narrow but deep set of functions by necessity of their job?
Why I'm asking: I want to get my ducks in a row to be able to argue that we must not cut the keyboard navigation component of the project in order to meet our first release date. I don't expect to have it cut, but I do expect it to be raised as a possibility and I want to be ready. :)
[As a friend once told me, "Don't tell me worrying doesn't help. The things I worry about don't happen!"]
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