Synonyms: Oz paradigm
A method of testing a system that does not exist. Research experiment in which subjects interact with a computer system, which is being operated or partially operated by an unseen human.
J. F. Kelley coined the terms "Wizard of Oz" and "Oz Paradigm" when he was working on his dissertation in the early 1980s. The phrase “Wizard of Oz” has come into common usage to describe a testing or iterative design methodology. An experimenter (the “wizard”), in a laboratory setting, simulates the behavior of a theoretical intelligent computer application (often by going into another room and intercepting all communications between participant and system).
A test participant may think he is communicating with a computer using a speech interface, when the participant's words are actually being entered into the computer by a person in another room (the “wizard”) and processed as a text or an audio stream.
Also check this University of Michigan Technical Report Documentation Page