Wizard of OZ (WOZ) is a well-established method used by researchers and product designers to simulate the functionality and user experience of future systems. Using a human wizard to mimic possible operations is particularly useful in situations where extensive engineering effort

would otherwise be required to explore a given design space. The method has been widely used in connection with speech and language technologies, but advances in sensor technology and pattern recognition as well as new application areas such as human-robot interaction have made WOZ increasingly relevant to the design of interactive systems.

https://pdfs.semanticscholar.org/05b2/8b11bf5eff5c50894e7dd09133197a351619.pdf