Fitts’ Law in action

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Presented by:Maina Gichangi (060673)

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Fitts Law Overviewy Is a model of human movement, predicting the time

required to rapidly move from a starting position to a finaltarget area, as a function of the distance to the target andthe size of the target

y The time to acquire a target is a function of the distance toand size of the target

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Fitts Law Overview Cont d

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Fitts Key Parametersy Fitts Law focuses on:

y Time to move to the targety Movement distance from the starting position to the

target centery Target width

y Deductions are:y That the farther away a target is, the longer it takes to

acquire it with the mouse and vice-versay That the smaller a target is, the longer it takes to acquire

it with the mouse and vice-versa

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Fulfilling Fitts Lawy W ays of fulfilling include:

1. Putting the controls closer to the current position

2. Making the controls bigger

Note:y There are fast target/access areas on a screen

y 4 corners (Magic corners)y 4 edges (Mile-high positions)

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Consider Ms Word 1.0

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Consider Ms Word 2003

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Consider MS Word 2007

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R edesign in Ms Office 2007y Use of top left corner reduces A

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R edesign in Ms Office 2007y Bigger size menu buttons increases M

y Scrolling of main menus using the mouse y As opposed to clicking each.y Sub-menus are displayed against each main menu no

more scrolling down!!

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R edesign in Ms Office 2007y Mini toolbar reduces A

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R edesign in Ms Office 2007y Q uick access toolbar reduces A

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Other thoughtsy Is a key factor to consider for interfaces with heavy use

of pointing devices

y Focuses only on the motor subsystemy Other input methods may require different

considerations e.g. natural voice, augmented reality,

touch holography

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R eferencesy http://www.interaction-

design.org/encyclopedia/fitts_law.htmly

http://particletree.com/features/visualizing-fittss-law/y http://www.cs.umd.edu/class/fall2002/cmsc838s/tichi

/fitts.htmly http://en.wikipedia.org/wiki/ Fitts'_lawy http://blogs.msdn.com/b/jensenh/archive/2006/08/2

2/711808.aspx