This technique of interpretation requires the interpreter to listen to a speaker in a source (or passive) language and orally translate that speech into another language in real-time, that is, simultaneously, through headsets and microphones. Interpreters were split into four sections, one for each official language, with three interpreters per section working from the other three languages into the fourth (their mother tongue). For instance, the English booth consisted of three interpreters, one working from German into English, one working from French, and one from Russian, etc.