Enabling Variable-Difficult Adventures in Pathfinder RPG
From the introduction:
This work proposes a new way of adapting roleplaying game adventure content to a variety of challenge and difficulty levels. This framework can be used to take an adventure, traditionally designed for an adventuring party of a certain level or narrow range of levels (e.g., “4th-level PCs” or “for characters of 10th-12th level”), and make it playable and enjoyable for a group of PCs of any level.
Although the nuts and bolts and language of this document have been constructed to correspond to the Pathfinder Roleplaying Game system, this approach will work similarly for any roleplaying game system. Mechanically, the adjustments that will have to be made will vary from RPG system to RPG system, but the general approach of “quadding” remains the same.