For example, the team at Amazon behind the Echo ran a Wizard of Oz MVP as part of their initial testing to understand the types of queries people would ask and how quickly they would expect a response. In one room, a user would ask “Alexa” questions and in another room, a human typed queries into Google, got answers, and replied back. The test users were not aware that they were not using software. The rest of the team was able to observe users and understand how they would use this new product—before significant engineering effort had been invested.