Input and Controls:

1. Make all controls operable from keyboard
2. Have all controls mounted on the front of the device (that is, facing the user)
3. Use push buttons primarily
4. Use concave buttons (especially where sustained force is required)
5. Avoid twisting motions (instead, use push buttons or edge controls)
6. Minimize force required for operation (that is, less than 2 Newtons)
7. Make all controls operable with one hand (preferably with one finger or assistive pointing device)
8. Make controls tactually discernible
9. Have tactile and audible actuation feedback for controls
10. Maximize sizes of controls within the space available