"Fitts's law is a model of human movement in human-computer interaction and ergonomics which predicts that the time required to rapidly move to a target area is a function of the distance to and the size of the target."
The extra effort you had to make to click the 'Start' button on the taskbar in early versions of Windows 95 (because the button didn't stretch all the way into the corner) is a nice illustration about the importance of this law. This has been fixed:
"Edges and corners of the computer display (e.g., Start button in Microsoft Windows and the menus and Dock of Mac OS X) are particularly easy to acquire because the pointer remains at the screen edge regardless of how much further the mouse is moved, thus can be considered as having infinite width."
"Fitts's law is a model of human movement in human-computer interaction and ergonomics which predicts that the time required to rapidly move to a target area is a function of the distance to and the size of the target."
The extra effort you had to make to click the 'Start' button on the taskbar in early versions of Windows 95 (because the button didn't stretch all the way into the corner) is a nice illustration about the importance of this law. This has been fixed:
"Edges and corners of the computer display (e.g., Start button in Microsoft Windows and the menus and Dock of Mac OS X) are particularly easy to acquire because the pointer remains at the screen edge regardless of how much further the mouse is moved, thus can be considered as having infinite width."