From GUI Bloopers, by Jeff Johnson (Morgan Kaufman Publishers, 2000). Used without permission.
This below is the main window of an application. It shows a toolbar, but no menu bar.
What's wrong with this?
What's right about this....?
All commands which are available to the user are in the menubar. Those which are most frequently used are in the toolbar.
The frequency of usage can be determined with user studies, and individual users may be able to customize the toolbar to serve their own needs.