1. Mike & Lizzie’s Awesome Dave-Wowing Interactive 3-D Multimedia Experience CS 655 (Programming Languages) University of Virginia Spring 2001

2. A Dangerous Scenario Customers deposit their hard-earned money in the bank Stressed-out, overworked primary system administrator goes on vacation Incompetent assistant system administrator uses banking network to play games Security hole found in WinNT software Diabolical intruder exploits security hole to steal money

3. Patching The Hole Patch also requires DetectBogusTransfer() Stop GetMyMoney() process (but leave other processes running) Install/activate DetectBogusTransfer() Install GetMyMoney() patch Restart GetMyMoney() process

4. Current Solution Approaches Distributed Software Dock (uses XML) RAPTOR (uses Z) Central authority for system maintenance

5. Desired Solution Features Formal specification Hierarchical organization Precondition analysis Properties over collections Temporal reasoning Scalability Natural way to adapt pre-existing systems