klingsor said:
At the risk of sounding like the paleo-gamer I am what is a living campaign?
It is a type of shared experience campaign.
Each group involved has a limited window to play and then report results, and the characters can be taken from one table to another without hindrance, but only games in the overall campaign matter.
There are several other approaches with similar effects:
TORG had specific scenarios that individual groups played on their own, then reported their results. The trend of the results were worked into the subsequent gameworld histories.
Task Force had been doing similar with a boardgame, Star Fleet Battles, years earlier... but not "officially"... the playtest reports generally had to meet the expectation, or the scenario got modified to do so, but also had to provide for the non-historic result.
2300's background was developed with a board game played in-house.
Many game companies advance their timelines through various products: AEG does the L5R one via the CCG tourney results; DP9 advanced their Heavy Gear by unknown means, then published the products with "dates" showing when in the timeline they were; Deep7 advanced the timeline of Arrowflight via free PDF newsletters; GDW advanced the Timeline of the OTU in the JTAS articles; Car Wars via revised core books and the ADQ magazine.
The living campaign system differs by having everyone play the same adventure at nearly the same time with very restrictive character generation rules, and little chance of prior knowledge of the adventure...