 American structural linguistics of the 1920s to 1950s championed the development of techniques for using corpora as a basis for developing structural descriptions of natural languages, although such work was really not practically possible until the wide-spread availability of cheap, powerful, and fast computers. André Martinet (1960: 1) notes that one of the basic assumptions of structuralist approaches to linguistics is that “nothing may be called ‘linguistic’ that is not manifest or manifested one way or another between the mouth of the speaker and the ears of the listener”. He is, however, quick to point out that “this assumption does not entail that linguists should restrict their field of research to the audible part of the communication process—speech can only be interpreted as such, and not as so much noise, because it stands for something else that is not speech.”