Topic: Fitts' LawLawrence FyfeCPSC 681

Fitts' Law Formula:

ID (index of difficulty) = log2(D/W +1)

Soukoreff R.W., MacKenzie I.S., 2004. Towards a standard for pointing deviceevaluation, perspectives on 27 years of Fitts' law research in HCI. InternationalJournal of Human Computer Studies, 61 (6), pp. 751-789.

Paul Fitts' Experiment:

Fitts, P.M., 1954. The information capacity of the human motor system in controllingthe amplitude of movement. Journal of Experimental Psychology 47 (6), 381–391.

Reciprocal Tapping Apparatus

Tapping Results:

Fitts, P.M., 1954. The information capacity of the human motor system in controllingthe 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 isometricjoystick, 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 isometricjoystick, step keys, and text keys for text selection on a CRT. Ergonomics 21, 601–613.

Card, S.K., English, W.K., Burr, B.J., 1978. Evaluation of mouse, rate-controlled isometricjoystick, step keys, and text keys for text selection on a CRT. Ergonomics 21, 601–613.

Target Size Results:

Problems:

http://particletree.com/features/visualizing-fittss-law/

Multidirectional Tapping:

Soukoreff R.W., MacKenzie I.S., 2004. Towards a standard for pointing deviceevaluation, perspectives on 27 years of Fitts' law research in HCI. InternationalJournal of Human Computer Studies, 61 (6), pp. 751-789.

User Interface Guidelines:

http://msdn.microsoft.com/en-us/library/ms993291.aspx

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.

Usability:

http://www.codinghorror.com/blog/archives/000642.html

Fitts' Law and Infinite Width

Questions?