費氏定理在應用中存在多個版本，那一個版本較好，一直是學界的研究重點之一。同時相關研究中也存在多個爭議，本研究重新審視定理的背景理論依據、與過去研究的不足處，重新檢視費氏定理的基本假設，反應時間只與工作困難度有關，與目標距離與目標大小無關；完成指標、或斜率是常數。以基於生理學的研究結果，結合之前心理學的觀察現象，提出並驗證一個新的模式。並探討文獻上對費氏定理應用建議不適之處，如有效寛度、與有效困難度的計算方式及應用時機。同時探討ISO9241-9所提出衡量人類行為資訊量的各種指標不適之處，並以資訊理論中的香儂資訊熵，作為動作資訊量的指標。文獻上對公式截距的意義解釋，以統計學的觀點詮釋。

There are varied versions of Fitts’s law available in the community. Which version is better has been a research hot spot for decades. This study reviewed the background of Fitts’s law, the disadvantages, and the research gaps in the literature. An experiment was designed to test hypotheses of Fitts (1954). First, MT is proportional to ID. Second, Ip or the slope is a constant for a specific movement. An alternative model was proposed in this study based on the findings in Physiology. Many issues in the literature, such as the method of estimating We and IDe, TP by ISO9241-9, were also discussed. A metric derived from the Shannon entropy is proposed to measure the information processing capability.

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