Semiotic Engineering

This must be one of the insightfullest grafs I've read in a long time:

It views HCI as computer-mediated communication between designers and users at interaction time. The system speaks for its designers in various types of conversations specified at design time. These conversations communicate the designers' understanding of who the users are, what they know the users want or need to do, in which preferred ways, and why. The designers' message to users includes even the interactive language in which users will have to communicate back with the system in order to achieve their specific goals. So, the process is in fact one of communication about communication, or metacommunication. — Clarisse De Souza