PBS has written a series of lessons on avoiding Armageddon. This is lesson 4 of 5 and focuses on defining terrorism. Upper graders watch episode 3 of "Avoiding Armageddon - The New Face of Terror," read how terrorism is defined by the League of Nations, UN, and the FBI, then research support that validates their personal definition of terrorism. A class debate follows. This lesson may be considered controversial and should be used with older students at your discretion.