The area of Interaction Design is relatively new, although its roots can be found in established professional and academic domains, such as Design and Computation or Social Science. Interaction-Design.org is an educational resource that makes knowledge in Interaction Design and related fields available to a wider audience. A new project is the Interaction Design Encyclopaedia, which follows the more traditional example of peer-reviewed articles but brings in audio-visual material as support.
For example, the entry on Visual representation that is featured today (February 2nd, 2011) beautifully illustrates why there is such a variety of representation styles and what they are good for.
