Model-It at the University of Michigan presents students with digitized photos, such as a stream...
Avalanche, from ThinkQuest, encourages students to tackle the impact of changes in the Earth's environment. The contents of this site respond to user input -- an interesting twist.
An early example of juggling multiple priorities is Hammurabi, a classic game of strategy and resource allocation. You can find examples of this and other simulations on the web.
Games like Hammurabi teach that there are also issues like quality-of-life that need to be accounted for.




