Created the roles of High Representative of the Union for Foreign Affairs and Security Policy and a permanent President of the European Council, providing clearer leadership in foreign affairs and EU summits
Brought the Charter of Fundamental Rights (CFR) into EU law, ensuring the protection of fundamental rights for all EU citizens
Clarified the roles and powers of EU institutions, making decision-making processes more transparent and accountable
Made Qualified Majority Voting (QMV) the default method for decision-making in most areas, speeding up the legislative process
Outlined a procedure for member states to leave the EU for the first time, providing a legal framework for potential withdrawals
Allowed certain member states, such as the UK and Poland, to opt-out of certain EU policies, such as those related to justice and home affairs
Strengthened coordination in foreign affairs and security policy, enabling the EU to speak with a more unified voice on the global stage