Contrainte qui représente les croyances, conventions et connaissances du monde que partagent les locuteurs d’une même communauté sociolinguistique et que, consciemment ou non, le traducteur mobilise au moment de la réexpression.

&

1- L’univers du discours est une contrainte interne, au même titre que les langues et la poétique. 

2- Dans , univers de connaissances et  univers de référence sont considérés comme des synonymes d’univers du discours. 

Constraint that refers to the sum total of the elements that pertain to the beliefs, conventions, and knowledge shared by the speakers of a given sociolinguistic community and which translators use either consciously or unconsciously when they reexpress discourse content in the target language.

&

In most cases, translators have to strike a balance between the Universe of Discourse […] as acceptable to the author of the original, and that other Universe of Discourse which is acceptable and familiar to the translator and his or her audience (Lefevere, 2004b, p. 35). Translators usually do not reject outright, but decide to rewrite on the level of both content and style.
During rewriting, translators’ attitudes toward the Universe of Discourse is heavily influenced by the status of the original, the self-image of the culture that text is translated into, the types of texts deemed acceptable in that culture, the levels of diction deemed acceptable in it, the intended audience, and the “cultural scripts” that audience is used to or willing to accept (Lefevere, 2004a, p. 87). 

Rewriting is subject to certain ‘intra-systemic’ constraints: language, the universe of discourse and poetics; it is also subject to the influence of regulatory forces, namely, the professionals within the literary system, and patronage operating from outside the system. Both types of constraint operate as ‘control factors’ in Lefevere’s model.