• (A) in broad terms, the kind of technical and software framework within which human system interaction takes place (e.g., wimp, mobile, tangible)
• (B) is used in the interface to help the user understand what to do (e.g., click on tabs to change window contents, use shopping cart
• (C) inputs and receive information from the system (e.g., click and drag an object, talk to an object, move self closer to an object, converse with
• (D) the conceptual model used to guide the design of the interface.