In such cases, text production does not have to be modelled as a cognitive process. In order to produce such a text one does not have to draw from implicit knowledge which is not formulated in the text. Furthermore, excepting stylistic variations and indexical elements, all the expressions and meanings are extremely stereotyped. And finally, one only needs to simulate the monological production of these not particularly coherent texts, i.e. without having to consider the essentially more complex conditions for dialogues which would require having to simulate the processes of text understanding. The items vary in length but, as a rule, they total about 101 to 120 sentences.
Sentences represent the key unit in the production of texts.
The first sentence of an item contains the core of the news, and the rest of the item refers to it in some way or another. Unlike almost any other text genre, no other structure exists beyond the sentence level if we forget the few anaphoric pronouns which could very well be produced by a random number generator. The empirical analysis shows that there are 38 moves which are typical of news bulletins and which can be combined in almost any order, i.e. not in a logical or conventionally ruled order. The second level is the fund of meanings which ought to serve to describe reality. In each of these pictures and fields there are specific and recurrent formulations which can be mixed beyond the boundaries of the given pictures or fields in almost any order to compose whole sentences.