Communications and open systems

摘要

The ultimate purpose of communications is understanding each other. Natural languages play the central role of communications, but other means such as gestures, facial expression, and gaze in the situations are equally important. Physical and social common sense is indispensable, and the historical backgrounds of nations, regions, families, and individuals of speakers and listeners are never negligible. All of these means, modes, and aspects are mutually dependent and change as time progresses.