Finger -vs. stylus

Consider the use cases of the application when deciding whether -to use finger or stylus control, or possibly hardware keys. Eliminate the -need to switch from using a finger or stylus on the touch screen, to using -any of the hardware keys. Design should enable completing a task with the -same interaction method as it was started with.

If your application -is intended to be used with the stylus, rather than a finger, try to present -this clearly to the users from the top level. It can be frustrating to start -using an application with finger touch, then switching to stylus, for example, -if the components on screen suddenly get smaller.

Decide whether -the application is to be used with a single hand, or two hands. Make sure -users are able to use at least the most important functions with only one -hand, even though the application is designed to be used mainly with two hands. - With touch screen devices, this means that the users should be able to perform -most basic actions with their thumb.

Applications that require the -use of both hands include:

Applications that require the use of stylus
Applications that are intended for landscape mode
Applications that require data input