Zones System - 10 or 11 zones?

I've read several books dealing with the Zone System. Some describe densities as falling from Zones 0-IX, while others range from 0-X. The longer scale includes an "extra" zone in the light areas, giving an inclusive range of 6 Zones with full detail; while the shorter scales indicate a subject brightness range of 5 as normal. Which is more useful and why is there a difference? I'm guessing that the 0-IX system is older and perhaps the 0-X system takes into account greater highlight separation of newer emulsions. If anyone knows the answer, I'd greatly appreciate it. Thanks. Chris

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