| 1 | We all know the problem with touch screens. | |
| 2 | Some will have keyboards, he said, while others will be exclusively touch screen. | |
| 3 | How would we step through an interaction using a touch screen? | |
| 4 | The only difference now is the screen size and the use of touch input. | |
| 5 | Sony Readers have touch screens; some models even have built-in illumination screens. |