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orion549 said: Well, I have to say I'm for option 2. In fact, I was for option 2 before I read option 2, because I was thinking about it while reading the intro and option 1. Yes, it doesn't give you an idea of what short stories or novellas take place during a previous one, however it gives you the best chronological numbering system I think even simplifying it to year and month of first action would be fine, that might help to demonstrate some of the books that are in the same timeframe, especially if they are started in the same month (yes, seveal books with 2684.5 might be a little confusing, but how often does this happen?)
Any other way is too limiting in the event you want to shove some stories in between things 15 years in the future. The only other thing I would add is a letter to the end to indicate the series, in case in the future things start to bleed together. Only do it for long series though. So All Pro could be 2684.1.2G for GFL series, Contagious would be 2009.1.20T for Triangle series, or something like that. Say Ancestor was a stand alone it would just be 2010.11.7, making it easy to see which books were a series with them still being in chronological order.