From the Introduction: "As President Donald Trump indicated in Executive Order 13767 'Border Security and Immigration Enforcement Improvements' (January 25, 2017), border security is critically important to the national security of the United States. The Department's ability to measure its border-security inputs, activities, outputs, and outcomes is essential to the effective and efficient management of the Department, including management of the new activities and investments directed by the President's Executive Orders on border security and immigration enforcement. Comprehensive and rigorous performance management data provide DHS leadership with the foundation to support responsible evidence-based decision-making for resource allocation and investments and for operational and mission management. Further, DHS implementation of this approach provides a pair of unifying border security goals under the Department's mission to secure and manage U.S. borders. As summarized in the 2014 DHS Quadrennial Homeland Security Review (QHSR), the Department's first two goals under the border security mission area are to 'Secure U.S. Air, Land, and Sea Borders and Approaches' by preventing illegal entry and to 'Safeguard and Expedite Lawful Travel and Trade' by safeguarding key nodes, conveyances, and pathways, and by managing the risk of people and goods in transit. Ultimately, the border security metrics described in this report are designed to assess the ability of the Department's border security policies and investments to achieve these outcomes."
U.S. Department of Homeland Security: http://www.dhs.gov/