Q1: How does Fitts’ law change for different physical selection devices, such as

Question

Q1:

How does Fitts’ law change for different physical selection devices, such as a three-button mouse, a touchpad, or a pen/stylus? (You’ll 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.

Explanation / Answer

Hi

Fitts' Law is nothing but  a method to measure the difficulty and time taken to move a mouse/finger/other pointing device from one place to another. The equation is given by:-

MT = a + b.D = a + b .log2 (2D/W) where

In general the equation implies following points :-

The two major takeaways from the above discussion is

Since for different physical selection devices, such as a three-button mouse, a touchpad, or a pen/stylus, the interface are different , so the time to perform the same task on same screen but on different devices differ. Say, for mouse the time required to hold it i.e. initial time 'a' as per equation is more as compare to touch pad where you need not to hold anything just use the finger.

Apart from interface, as the screen size changes, the distance between the two points changes relatively for the same screen e.g. you are playing a game in phone and then the same game in desktop, moving from a point 'A' to 'B' will take different times because the relative difference between them has increased in case of desktop rather than mobile with the increase in screen size.

Also, for same page being appeared on mobile and desktop the size of the components like button and all vary with the variation of screen size.

So, we conclude for different devices, constants and equation vary and Law changes.

Thanks!!!:)

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