design - Fitts Law, applying it to touch screens -

Recently UI is reading a lot in design and keeps popping up.

Basically a big item, and closer to your cursor, clicking on it is easier.

What about the touch screen device where the input comes from many touch or only one touch. / P>

What is the basic things to keep in mind for considering this?

Is there something like this, that the user's hands are on the side of the device so that the button should be closed in the left and right hand side of the device?

Thanks

Yes, implementing Touch Screen Fits Law in three dimensions , So it is different from the classical mouse movement ideas.

As you say, the origin of the movement is often the default position of the finger. It varies greatly depending on the device where the screen is mounted. On a hand-held device, you can use the index finger of one hand or the thumb of both hands, depending on the design.

In addition, on the touch screen, you have to remove the fingers from the screen to see which makes the distance between the controls less important, as if you return to the default position between clicks .

Apart from the laws of Fitts, there is the intuitiveness of the interface to consider. If a button appears where it is not expected, then no matter how close it is, it will take time to find it.