jester47 said:
The wikipedia entry for role playing game covers it pretty well.
http://en.wikipedia.org/wiki/Role-playing_game
I see three problems with that definition:
1. It is not short.
2. It is not simple.
3. It does not stick to the basics.
In addition, it takes an erroneous assumption as true. I'll deal with this last here.
Ask yourselves, when you play an RPG are you really engaged in collaborative story telling? I submit that you are not. Through the medium of your character you and your fellows are involved in an adventure. Your fictional character is having a fictional adventure in a fictional world. This as part of his fictional life. Really what the characters are doing is living a fictional life, with all the vicissitudes of life, as they adventure.
Consider this fact, no matter how carefully things are laid out events rarely happen as they are supposed to. You simply don't have the control over events in an RPG session that you do when telling a story.
In reality the players are engaged in collaborative story
creation (my emphasis). Story creation in that the events that occur in an adventure can be recounted later, and become the basis for a story. In the adventure the characters are living. It is later, when they relate what they did during the adventure, that the story of the adventure is told.
Furthermore, the Wikipedia entry says nothing about where the adventure takes place. Adventures take place somewhere. That somewhere may be restricted or not, but it is somewhere. Adventures have a location, they occur in a world.
You get right down to it, you can't have adventures without a place where they can occur. Even if the location is only a dungeon complex, it is still a location. An extremely constrained world but still, a world. You can't get anymore basic than that.
Remember:
Keep it short.
Keep it simple.
Stick to the basics.
Once you have the foundation established then you can build on it.