To be able to model the requirement of the pervasive usability, this paper inducts perceptual control model.
为了能够建模普适可用性的需求，引入感知控制模型。
The user interface based on pervasive usability is closer to the user's task model, and can reduce their cognitive burden when operating the system.
普适可用性的原则就是让用户界面的设计贴近于用户的任务模型，拉近了系统与用户的距离，降低用户使用系统时的认知负担。
In order to develop the usable system for the folks, this paper proposes pervasive usability, by analyzing the problem of the traditional usability in pervasive computing environment.
为了开发对普通大众用户可用的系统，本文通过分析传统可用性在普适计算环境下所面临的问题，提出普适可用性。
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