II, simultaneous interpretation came into use at the Nuremberg trial, and began to be more accepted. Experienced consecutive interpreters asserted that the difficulties of listening and speaking at the same time, adjusting for differences in sentence structure between languages, and interpreting the beginning of a sentence before hearing its end, would produce an inferior result. As well, these interpreters, who to that point had been prominent speakers, would now be speaking invisibly from booths. In 1951, when the United Nations expanded its number of working languages to five (English, French, Russian, Chinese and Spanish), consecutive interpretation became impractical in most cases, and simultaneous interpretation became the most common process for the organization's large meetings. Consecutive interpretation, which provides a more fluent result without the need for specialized equipment, continued to be used for smaller discussions. Whispered Since time immemorial, whispered interpretation has been used, known in the trade by the French term chuchotage. To avoid disturbing the original speaker and those present listening to the original speaker, the interpreter's voice is kept at a low volume. To do this, the interpreter and the person requiring interpretation must sit or stand in close proximity to one another. No actual whispering is involved as this is difficult to decipher as well as being too much of a strain on the voice: the interpreter uses normal 'voiced' speech at a low volume. Only one or at the most two people in need of interpretation can be accommodated, unless portable electronic equipment is used. This form of interpretation puts a strain on the interpreter who has to sit for long periods leaning towards the person in need of interpretation. Types Conference Conference interpreting refers to interpretation at a conference or large meeting, either simultaneously or consecutively. The advent of multi-lingual meetings has reduced the amount of consecutive interpretation in the last 20 years. Conference interpretation is divided between two markets: institutional and private. International institutions (EU, UN, EPO, et cetera), which hold multilingual meetings, often favor interpreting several foreign languages into the interpreters' mother tongues. Local private markets tend to have bilingual meetings (the local language plus another), and the interpreters work both into and out of their mother tongues. These markets are not mutually exclusive. The International Association of Conference Interpreters (AIIC) is the only worldwide association of conference interpreters. Founded in 1953, its membership includes more than 2,800 professional conference interpreters, in