In "The Art of Reckoning," Charlie discusses the security of a prison. "It's a hyper-secure system, but prisoners have nothing to do except think about how to crack it. Like two opposing armies." Charlie explains that analyzing such a situation involves determining the 'probabilities of penetration' by considering the ratio of vulnerable points to the resources required to defend that point.
In this activity, students analyze a game in which a spy is attempting to break into a fort.

Download the attached PDF and look over the Teacher Page.

Discuss the materials from the Student Page with your class.

Encourage students to explore web sites and questions from the Extensions Page.