Basic Principles
Most mobile devices with a virtual keyboard have a modified QWERTY Layout, which can be used over a pen or a finger. However, a conflict can result out of the followed two reasons: on the one hand from the demand for ergonomically large keys and on the other hand from a small space requirement as possible on the screen. Because virtual keyboards can be served on mobile devices mostly just with one finger or a pen instead of ten fingers, the speed of the input is much lower. In that case the important question could be whether QWERTY is the right layout for the mobile sector and how it will be possible to optimize the text input for mobile devices. On the basis of three different solutions we tried to transfer the emphasis from the analysis into three text input prototypes. Above all the following principles were considered:
- A | The applicability range should be as large as possible
- B | A text input method should be simple easy to learn
- C | The input speed should be as high as possible
- D | The error rate should be as small as possible