During the process of the enlargement of the European Union, the acquis was divided into 31 chapters for the purpose of negotiation between the EU and the candidate member states for the fifth enlargement (the ten that joined in 2004 plus Romania and Bulgaria which joined in 2007).
Dalam proses perluasan Uni Eropa, acquis terbagi menjadi 31 bab untuk keperluan negosiasi antara Uni Eropa dengan calon negara anggota dalam hal perluasan kelima (sepuluh negara yang bergabung tahun 2004 plus Rumania dan Bulgaria tahun 2007).