Harold Fuchs wrote:

> If you really want to enhance the UI, implement the facility where 
> ***every*** possible option is available from the keyboard so that real 
> typists don't have to keep switching between it and the mouse. 

+1

> ... There's an 
> ancient organisation in Japan responsible for inventing and improving the 
> "algorithms" used on a Japanese abacus (which is different from either a 
> Chinese one or a Russian one). Years and years ago they discovered that the 
> most time consuming activity when using an abacus is the *attention* switch 
> (not the finger switch) required to move from one column of beads to 
> another. Minimising the number of such moves can drastically improve 
> performance. ...

+10
Attention / brain seconds are *very limited*  Burn those up just
managing a task and there is nothing left for the task.  Look at the
suffocating fish look that people get after fiddling with M$ UIs for a
few hours.

> If done properly you could even make the same key combination mean different 
> things in different contexts so you wouldn't run out of keys.

See WordStar menus.

> Do you use professional "usability labs"? These are organisations that get 
> people in off the street to try to use a piece of software. Typically the 
> people don't have any training. They are observed & interviewed to find what 
> comes easily and what doesn't. The results are used to improve the 
> software's UI. I have usually found them very useful.

+1

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