Human–Computer Interaction

54

Human–ComPuter InteraCtIon

of the performance and mathematically deriving them by regression

(Figure3.20).

Note that the original Fitts’s law was created for interaction with

everyday objects (in the context of operation in factory assembly lines)

rather than for computer interfaces. Researchers have applied the con-

cept of Fitts’s law to computer interfaces and have found that the same

principle applies. For instance, as shown in Figure3.21, the task of

“dragging an icon into a trashcan icon” using a mouse can be assessed

using Fitts’s law [25]. Many other computer interactive tasks can be

1.4

1.35

A (cm)

16.4

16.4

16.4

24.6

24.6

24.6

2.46

4.92

7.38 ...