Understanding Fitts's Law in Human-Computer Interaction
Discover the principles of Fitts's Law and its significance in human-computer interaction, including insights on target selection and movement efficiency. Explore interactive exercises and resources to deepen your understanding.
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King Saud University College of Engineering IE 341: Human Factors Spring 2016 (2nd Sem. 1436-7H) Chapter 3. Information Input and Processing Part 2 Prepared by: Ahmed M. El-Sherbeeny, PhD 1
Fittss Law Fitts s Law is used to reach a relation between o size of as well as distance to target o and speed (or response time, RT) to reach target Target can be button on screen or break pedal, etc. This has many (increasing) applications in HCI (human-computer interaction) The most important finding: edges of a screen are easiest (i.e. shortest time) to reach: can you show how? 2
Fittss Law Fitts s Law: ? ?+ 1 ? = ? + ?log2 D: distance to target (aka amplitude) W: width of target (i.e. target size, e.g. button) Note, there are different versions of Fitts s Law (e.g. 2D/W instead of D/W + 1) 4
Fittss Law Link to good video on Fitts' (or Fitts's) Law https://youtu.be/E3gS9tjACwU Interactive Exercise on Fitts s Law http://fww.few.vu.nl/hci/interactive/fitts/ Another interactive exercise and further explanation: http://www.psytoolkit.org/lessons/fitts.html 5
