New Slides: NSA slides explain the PRISM data-collection program

This slide describes what happens when an NSA analyst "tasks" the PRISM system for information about a new surveillance target. The request to add a new target is passed automatically to a supervisor who reviews the "selectors," or search terms. The supervisor must endorse the analyst's "reasonable belief," defined as 51 percent confidence, that the specified target is a foreign national who is overseas at the time of collection....

http://www.washingtonpost.com/wp-srv/special/politics/prism-collection-documents/