Problem:
Assume you have been appointed as the new Secretary of Homeland Security. You have been given a detailed risk assessment of the terrorist threat posed to a wide variety of cities and other targets and a choice: due to resource and budget constraints, you can partially address all of these threats (probably by just dividing the resources equally among all jurisdictions) or fully-address only 50% of the threats. Which do you choose and what criteria do you use to make that decision?