The Trans-Pacific Strategic Economic Partnership Agreement (TPP agreement) is a multilateral free trade agreement that aims to integrate the economies of the Asia-Pacific region. The original agreement between the countries of Brunei, Chile, New Zealand and Singapore was signed on June 3, 2005, and entered into force on May 28, 2006. Five additional countries, including Australia, Malaysia, Peru, United States, and Vietnam, are currently negotiating to join the group.