# 費茨法則

## 模型

${\displaystyle T=a+b\log _{2}{\Bigg (}1+{\frac {D}{W}}{\Bigg )}}$

• T 是完成動作的平均時間。（傳統的命名方式，會寫成MT ，表示運動時間 Movement Time
• a 代表裝置（攔截）開始/結束的時間，b 表示該裝置本身的速度（斜率）。這些常數可以以測得數據進行直線近似的方式通過實驗取得。
• D 是起始位置到目標中心的距離。（傳統上來說，研究者多用 A 來表示，意味着運動的振幅 Amplitude
• W 是目標區域在運動維向上的寬度。因為運動的最終點必須落在目標中心 ±W2 以內，所以 W 也可以被認為是被允許的最終位置的容差。

## 參考文獻

• Paul M. Fitts (1954). The information capacity of the human motor system in controlling the amplitude of movement. Journal of Experimental Psychology, volume 47, number 6, June 1954, pp. 381-391. (Reprinted in Journal of Experimental Psychology: General, 121(3):262–269, 1992).
• Paul M. Fitts and James R. Peterson (1964). Information capacity of discrete motor responses. Journal of Experimental Psychology, 67(2):103–112, February 1964.
• Stuart K. Card, William K. English, and Betty J. Burr (1978). Evaluation of mouse, rate-controlled isometric joystick, step keys, and text keys for text selection on a CRT. Ergonomics, 21(8):601–613, 1978.
• I. Scott MacKenzie and William A. S. Buxton (1992). Extending Fitts' law to two-dimensional tasks. Proceedings of 電腦協會 CHI 1992 Conference on Human Factors in Computing Systems, pp. 219–226. http://doi.acm.org/10.1145/142750.142794
• A. Murata. Extending effective target width in Fitts' law to a two-dimensional pointing task. International Journal of Human-Computer Interaction, 11(2):137–152, 1999. http://www.leaonline.com/doi/abs/10.1207/S153275901102_4[永久失效連結]
• Johnny Accot and Shumin Zhai (2003). Refining Fitts' law models for bivariate pointing. Proceedings of ACM CHI 2003 Conference on Human Factors in Computing Systems, pp. 193–200. http://doi.acm.org/10.1145/642611.642646
• Johnny Accot and Shumin Zhai (2002). More than dotting the i's — foundations for crossing-based interfaces. Proceedings of ACM CHI 2002 Conference on Human Factors in Computing Systems, pp. 73–80. http://doi.acm.org/10.1145/503376.503390
• Stuart K. Card, Thomas P. Moran, 艾倫·紐厄爾 (1983). The Psychology of Human-Computer Interaction.
• I. Scott MacKenzie (1992). Fitts' law as a research and design tool in human-computer interaction. Human-Computer Interaction, volume 7, 1992, pp. 91–139. http://www.yorku.ca/mack/hci1992.pdf頁面存檔備份，存於互聯網檔案館
• Meyer, D. E., Smith, J. E. K., Kornblum, S., Abrams, R. A., & Wright, C. E. (1990). Speed-accuracy tradeoffs in aimed movements: Toward a theory of rapid voluntary action. In M. Jeannerod (Ed.), Attention and performance XIII (pp. 173–226). Hillsdale, NJ: Lawrence Erlbaum. http://www.umich.edu/~bcalab/Meyer_Bibliography.html頁面存檔備份，存於互聯網檔案館
• A. T. Welford (1968). Fundamentals of Skill. Methuen, 1968.
• Shumin Zhai (2002). On the Validity of Throughput as a Characteristic of Computer Input, IBM Research Report RJ 10253, 2002, Almaden Research Center, San Jose, California. https://web.archive.org/web/20070824104223/http://www.almaden.ibm.com/u/zhai/papers/ZhaiIBMReporRJ10253.pdf