Topic: Fitts' Law Lawrence Fyfe CPSC 681. Fitts' Law Formula: ID (index of difficulty) = log 2 (D/W +1) Soukoreff R.W., MacKenzie I.S., 2004. Towards.

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Presentation transcript:

Topic: Fitts' Law Lawrence Fyfe CPSC 681

Fitts' Law Formula: ID (index of difficulty) = log 2 (D/W +1) Soukoreff R.W., MacKenzie I.S., 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

Paul Fitts' Experiment: Fitts, P.M., The information capacity of the human motor system in controlling the amplitude of movement. Journal of Experimental Psychology 47 (6), 381–391. Reciprocal Tapping Apparatus

Tapping Results: Fitts, P.M., 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., 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., Evaluation of mouse, rate-controlled isometric joystick, step keys, and text keys for text selection on a CRT. Ergonomics 21, 601–613.

Card, S.K., English, W.K., Burr, B.J., 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:

Problems:

Multidirectional Tapping: Soukoreff R.W., MacKenzie I.S., 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

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.

Usability: Fitts' Law and Infinite Width

Questions?