Chaosium's core system, as originally designed by Steve Perrin and the other authors of RuneQuest and later used in almost every Chaosium game.

The book includes sections on: an "Introduction", "Materials", "Stats to Acts", "Did It Work?", "Moving Along", "The Rewards of Success", "The Cost of Failure", "Military Skills", and "A Solo Scenario". There's also simple charts and character sheets.