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The Lisbon Treaty (also referred to as; Reform Treaty or "Simplified Treaty", among others) is a replacement for the Treaty establishing a Constitution for Europe. While the Constitution attempted to replace all earlier EU treaties, the Reform Treaty amends them. In This sense the formal title of the treaty is Treaty of Lisbon amending the Treaty on European Union and the Treaty establishing the European Community.

25 March 2007: EU leaders vowed to put the EU on a "renewed common basis before the European Parliament elections in 2009" at the celebrations of the EU's 50th anniversary in Berlin.
21-22 June 2007 : At the European Council, a detailed IGC mandate was agreed.
23-24 July 2007: The Intergovernmental Conference was opened by the Portuguese Presidency.
19 Oct: 2007: The final text of the Lisbon Treaty has been adopted at an informal Council in Lisbon.
13 Dec. 2007: The 27 Heads of State and Government met in Lisbon to sign the new treaty.
June 2009: Before the European Parliament elections the ratification process should be finalised.

Preparation Stage

Negotiation Stage

Ratification Stage

Text of the Lisbon Treaty
Consolidated versions of the Treaty on European Union and the Treaty on the functioning of the European Union (PDF) (Word) Treaty of Lisbon amending the Treaty on European Union and the Treaty establishing the European Community, (OJ C306 17.12.2007) (HTML)
Treaty of Lisbon amending the Treaty on European Union and the Treaty establishing the European Community, signed at Lisbon, 13.12.2007. (PDF)
Final Act, signed at Lisbon, 13.12.2007. (PDF)