(from the introduction)
GET READY FOR ACTION!
The Action! System is a set of rules for role-playing adventure games. It is designed to be easy to both learn and play, while offering flexibility for all types of players and genres. The Action! System is written to emulate the same kinds of stories you might read in books or comics, or watch on television and movies. Using the Action! System you can create characters and stories as fun and exciting as any you have seen, heard, or read. We think the most fun of Action! is to create wholly new stories, but no one kind of interactive storytelling is favored over another.
With the Action! System rules you can create characters and play games in nearly any setting, creating exciting adventures and interactive stories. You can play an honorable samurai, brave Musketeer, superhero, Wild West gunslinger, or just about anything else you can imagine. If you can imagine it, Action! System gives you the tools to tell your story interactively.