Nice simple chart, a bit less intimidating than some of the other charts out there. Good for a general guide to start off with.
One thing to keep in mind with this chart though is that it is just a rough guide, as outside of Cuba, there is no standardization on sizes and names of vitolas, manufacturers are free to make whatever they want and call it whatever they want. This is why in NCs, we have things like 56 x 6" robustos, 52 x 7" churchills, 42rg lanceros... etc.
Here are some Cuban cigar guides that are broken down a bit more:
http://www.cubancigarwebsite.com/lis...mmon-names.htm
http://www.cubancigarwebsite.com/inf...m#Cigar_Images