Notes on Defining of Computer-Mediated Communication, by John December
CMC Involves Mediated Communication
Sculptors who work in clay, stone, or soap each gain a feel for the sensibilities of their chosen medium. These materials feel and look different and take manual force differently. Likewise, users and researchers in online communication work with different kinds of "stuff."
I've described the stuff of the Internet in terms of media classes, media objects, and media instances (December, 1996). These definitions rely on the common triad of client-server-content relationships that pervade Internet communication. These media classes, objects, or instances, when situated within contexts, can be studied.