Q1:

How does Fitts law change for different physical selection devices, such as a three-button mouse, a touchpad, or a pen/stylus? (Youll need to do some research for this.)

Q2:

Word processor for blind people: A word processor for blind users is needed, which can also be operated by sighted people. It has to support the standard set of word-processing tasks.

Choose a suitable combination of input and output devices to best support the intended interaction. It may help to identify typical users or classes of user, and identify how the devices chosen support these people in their tasks. Explain the major problems that the input and output devices solve.

Q3:

Most common WIMP arrangements work on the basis of a desktop metaphor, in which common actions are likened to similar actions in the real world. For example, moving a file is achieved by selecting it and dragging it into a relevant folder or filing cabinet. The advantage of using a metaphor is that the user can identify with the environment presented on the screen. Having a metaphor allows users to predict the outcome of their actions more easily.

Note that the metaphor can break down, however. What is the real-world equivalent of formatting a disk? Is there a direct analogy for the concept of undo? Provide at least 3 examples from the desktop icons.