Keyboard
level analysis: ShortTalk + pointing
v. keyboard + mouse
nEstimate time for various actions and sum them to provide indication of how long specific edit tasks take
nCombining mouse and keyboard is very expensive due to need to home hands
nShortTalk + pointing
for many tasks several times faster because homing is eliminated and
because of much more succinct expression of editing
intention
nBut analysis does not
include cognition effort