Full Idea
The emphasis shifts from what each can will without contradiction to be a general law, to what all can will in agreement to be a universal norm.
Gist of Idea
Move from individual willing of a general law, to willing norms agreed with other people
Source
Jürgen Habermas (Moral Consciousness and Communicative Action [1990], p.67), quoted by James Gordon Finlayson - Habermas Ch.5:69
Book Reference
Finlayson,James G.: 'Habermas' [OUP 2005], p.69
A Reaction
This strikes me as being very close to Scanlon's contractualism. As expressed here, it sounds more vulnerable than Kant's full universality to the problem of Nazis agreeing odious universal norms. Habermas calls it 'discourse ethics'.
Related Idea
Idea 15667 To understand a statement is to know what would make it acceptable [Habermas]