The key rules adopted within the Schengen framework include: 

• Removal of checks on persons at the internal borders;
• A common set of rules applying to people crossing the external borders of the EU Member States;
• Harmonisation of the conditions of
• entry and visa rules for short stays;
• Enhanced police cooperation (including rights of cross-border surveillance and hot pursuit);
• Stronger judicial cooperation through a faster extradition system and transfer of enforcement of criminal judgments;
• Establishment and development of the Schengen Information System (SIS).