from the introduction:
We believe that roleplaying is more important than rules-playing. This is why we have condensed these rules into a single page.
The cardinal rule is: if there isn’t a rule for it – make it up as you go along. Have fun!
from supplement 1: Dead Simple Game Mastering:
As you read Dead Simple you will quickly realize that there aren’t rules for every eventuality. The desire to do this is what has led many games companies to create rulebooks that are hundreds of pages long. People who have been games masters in some of the commercial role-playing games may have a bit of unlearning to do.
This simple one-page system is geared for fantasy with a number of similarly brief supplements to augment it. The system has been used to create other games in other genres and settings from the original.