Organize the user interface so that the information flows either vertically or horizontally, with the most important information always located in the upper-left corner of the screen.
Group related controls together using either white space or a frame.
Place the most commonly used command button first.
Assign meaningful captions to command buttons.
Place the caption on one line and use from one to three words only.
Command buttons in the interface should be sized relative to each other.
If the command buttons are centered on the bottom of the screen, then each button should be the same height; there widths, however, may vary.
If the command buttons are stacked in a corner, then each should be the same height and the same width.
