The third part discusses the nature of HCI respectively from three perspectives: the idea of phenomenology, the question concerning technology, and the fusion of horizons.

• 第三部分讨论了人机界面的本质,分别从现象学的观念、技术的追问和视域的融合三个角度阐述了从理论理性到实践理性的转变过程中的人机界面的本质。