The Peterson Institute for International Economics asserts that "the TPP includes more protections of labor rights than any previous US free trade agreement." In January 2016, Human Rights Watch said that the TPP side agreements with Vietnam, Malaysia, and Brunei "are a unique and significant step in efforts to protect labor rights in trade agreements" but noted that enforcement of these rules remains to be seen: "gauging compliance will require subjective assessments by the US that may take years to carry out and face obstacles arising from foreign policy objectives, commercial interests, and other political considerations."