The theory behind Fitts' well-known pointing law, commonly used in human-computer interaction. Also, some recent work in modelling users' pointing performance.
Presented in the Fall of 2006 for CPSC 544 (http://www.cs.ubc.ca/~cs544/Fall2006/)
18. Fitts’ in two dimensions Image from MacKenzie, I. S. and Buxton, W. 1992. Extending Fitts' law to two-dimensional tasks. What to use as W ? Status-quo ( W ) Smaller-of (min( H , W )) Approach ( W ´ ) Perimeter ( H + W ) Area ( H * W )
19. Fitts’ in two dimensions Image from MacKenzie, I. S. and Buxton, W. 1992. Extending Fitts' law to two-dimensional tasks. What to use as W ? Status-quo ( W ) Smaller-of (min( H , W )) Approach ( W ´ ) Perimeter ( H + W ) Area ( H * W )
23. Implications of BP Law Third empirical parameter Ideal W:H ratio for rect. areas Directional stability v. “landing”
24. Accot & Zhai 1997 Image from Accot J. and Zhai S. 1997. Beyond Fitts' law: Models for trajectory-based HCI tasks.
25. Application of steering Evaluate non-pointing tasks Performance on changing path Image from Accot J. and Zhai S. 1997. Beyond Fitts' law: Models for trajectory-based HCI tasks.