This is an intriguing discussion, but I fear "Usability =
Predictability" is a bit of an oversimplification. So just to
antagonize...
Consider an application with 150 functions. The UI for this application
consists of a single screen, with a short sentence describing each
function in 6pt text. There is a 8x8 pixel green button next to each
sentence. Instructions at the top of the screen say "Click the green
button next to the function you wish to perform."
Assume the text completely explains the function so any user can
understand it, and when they click the tiny green button they get
exactly the function they expect from the description of the function.
This UI strikes me as 100% predictable, but I doubt any of us would
consider it usable.
So, it seems to me that as elegant as the original equation is, we might
need something more along the lines of
findability + accessibility + predictability = usability
Anybody want to add some more terms to the equation?
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