Chapter 3 The physical interaction with small screens is limited by the size of our hands. In this chapter we look at one-handed and two-handed interaction, and outline the basic interaction methods for small screens. This is followed by an introduction to the more commonly used input devices; from the scroll wheel to the virtual keyboard. The importance of instant feedback, as a crucial element for interaction, is also discussed, as are the concepts of natural mapping and motor memory and their implications on positioning control elements in relation to the screen. A