7.2.4-11 Appropriate Use of Arrow Buttons

A set of arrow buttons should be considered as the input device when it is desirable to incrementally increase or decrease a variable from its previous value.

Additional Information:
Arrow buttons change values sequentially as each increase or decrease button is pressed. In addition, values may change continuously if a button is held down. These inputs provide feedback about the magnitude of the change (i.e., the magnitude increases with the number of presses or the time that a button is held down). Such feedback may reduce the likelihood of producing large errors or increase the likelihood of detecting them. Some soft controls have two sets of arrow buttons, one for small and one for large incremental changes. Arrow buttons are sometimes combined with a slider in a soft control.