So far, the two descriptions, that of the lexicon and that of the grammar, have rarely been carried out simultaneously, although proper methods of representation have been available for the last twenty years. High quality of processing, which entails full coverage of languages, results in the processing of large amounts of data, that is, low rates of failures due to a simple lack of linguistic information, such as the absence of a word in a dictionary. Simple and compound utterances have to be compiled in large figures, the syntactic structures that accommodate these large lexicons are also in large numbers. All this information must be coherently structured. In order to be accessed, the data must be represented in a coherent form, then translated into computer form.
Tools have to be devised for classifying, comparing and retrieving the data.
In fact, a rather powerful computer technology is required to handle lexicons and grammars of any significant size. The treatment of texts Studies have started from the existing lexical material elaborated in each language, but once dictionaries, textbooks and theoretical studies have been exploited, this material runs short of providing the kind of coverage needed for computational applications. The treatment of large amounts of texts is a new area whose development is expected in many applications. It is only recently that texts are computationally produced on a large scale by Administrations and Companies. A large variety of texts are thus stored, and tools to retrieve them by content rather than by indexing will have to be developed.