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1. FUNnel

2. RPG vs RPE

3. GENIUS

4. King Author

5. Godot Monkey

IMHO

RPG Theory & other stories

1. The FUNnel Model

2. RPG vs RPE: Art Forms with Elves

3. Where's the Fun? GENIUS Theory

4. King Author: Drama featuring K,F & S

5. GM's Role: The Godot Monkey Unleashed

Impact on RPG/E Design

Influences & Further Reading

The Forge - Especially  the Articles

Anyway - Vincent D Baker

I Have no words and must design - Greg Costikyan

Waiting for Godot - Samuel Beckett

My word, there's a lot of RPG theories out there!

Fortunately, Ockham's on my side...