Handy How-Tos: The Message in the Medium | Shared Story Worlds - A Resource for Collaborative Worldbuilding
Excerpt.... I've posted the final questions:
"Some Questions to Consider:
What mediums are you skilled in or knowledgeable about?
What medium best suits the primary or core shared world narrative?
Do you want to encourage cross-medium submissions, competing-medium submissions, or both?
What mediums would you like to accept as contributions (and are you capable of processing/posting them)?
How does your submission process change based on the contributions medium you choose to accept?"