In my opinion, the points made by Vitruvius should be ranked from most to least important as Stability, Utility, and then Beauty. I came to this conclusion quite logically, thinking the most important has to be stability because, without stability, you would not be able to have utility and beauty. From there it was more of a toss-up, but utility came second because I value something being useful over beautiful. I put beauty last because I determined that it was the least useful item in building a “successful” structure.