Single institutional framework
The concept of the single institutional framework was a corollary of the institutional architecture of the Treaty of Maastricht. (Article 3 of the Treaty) Its objective was to ensure consistency and continuity in the actions needed to achieve the objectives of the European Union (EU). This implied that the institutions serving the Union and the Community were the same. These institutions thus participated in the decision-making process for the various pillars of the European Union.
The Treaty of Lisbon simplifies the European institutional architecture. It eliminates the pillar structure and replaces the European Community with the European Union.