Source — Wikipedia, "André Lefevere"

Extract

Lefevere developed translation as rewriting: "any text produced on the basis of another has the intention of adapting that other text to a certain ideology or to a certain poetics, and usually to both." The idea grew out of polysystem theory — translation understood as taking place inside specific cultural systems shaped by ideological and political constraints within the target language.
His major synthesis is Translation, Rewriting, and the Manipulation of Literary Fame (Routledge, London and New York, 1992) — the title itself states the thesis: translation actively manipulates how a literary work is perceived and valued once it crosses into another culture.
With Susan Bassnett he co-developed the claim that "neither the word, nor the text, but the culture becomes the operational 'unit' of translation," and the two co-authored Constructing Cultures (1997, published after Lefevere's death) — this partnership is credited with shifting translation studies toward cultural analysis and away from a purely linguistic-mechanical account.

This page gives Constructing Cultures a 1997 publication date; the Bassnett source page (also Wikipedia) gives 1998. Both are tertiary and disagree with each other; this project does not resolve the discrepancy and cites neither year as settled.
Ideology and poetics are named here as Lefevere's "primary forces," but the fuller three-part framework (patronage, poetics, ideology) and Lefevere's own quoted formulation of how they interact come from the Liu 2010 source page, not this one — this page's account is thinner on the patronage concept specifically.
As with the Bassnett page, none of this is checked against a primary Lefevere text by this project.