Transcript fitts-law-methodology

Topic: Fitts' Law
Lawrence Fyfe
CPSC 681
Fitts' Law Formula:
ID (index of difficulty) = log2(D/W +1)
Soukoreff R.W., MacKenzie I.S., 2004. Towards a standard for pointing device
evaluation, perspectives on 27 years of Fitts' law research in HCI. International
Journal of Human Computer Studies, 61 (6), pp. 751-789.
Paul Fitts' Experiment:
Reciprocal Tapping Apparatus
Fitts, P.M., 1954. The information capacity of the human motor system in controlling
the amplitude of movement. Journal of Experimental Psychology 47 (6), 381–391.
Tapping Results:
Fitts, P.M., 1954. The information capacity of the human motor system in controlling
the amplitude of movement. Journal of Experimental Psychology 47 (6), 381–391.
Fitts' Law and HCI:
Card, S.K., English, W.K., Burr, B.J., 1978. Evaluation of mouse, rate-controlled isometric
joystick, step keys, and text keys for text selection on a CRT. Ergonomics 21, 601–613.
Distance Results:
Card, S.K., English, W.K., Burr, B.J., 1978. Evaluation of mouse, rate-controlled isometric
joystick, step keys, and text keys for text selection on a CRT. Ergonomics 21, 601–613.
Target Size Results:
Card, S.K., English, W.K., Burr, B.J., 1978. Evaluation of mouse, rate-controlled isometric
joystick, step keys, and text keys for text selection on a CRT. Ergonomics 21, 601–613.
Problems:
http://particletree.com/features/visualizing-fittss-law/
Multidirectional Tapping:
Soukoreff R.W., MacKenzie I.S., 2004. Towards a standard for pointing device
evaluation, perspectives on 27 years of Fitts' law research in HCI. International
Journal of Human Computer Studies, 61 (6), pp. 751-789.
User Interface Guidelines:
1. The blue line represents the boundary of the clickable region.
2. The example on the right shows how a larger clickable space is easier to target.
3. An example of small click targets in close proximity,
making it difficult to target them easily.
http://msdn.microsoft.com/en-us/library/ms993291.aspx
Usability:
Fitts' Law and Infinite Width
http://www.codinghorror.com/blog/archives/000642.html
Questions?