As I overhaul my contra deck and realize that my difficulty ranking system is super incoherent, and most of my dance rankings are from way before I had any idea what actually makes a dance easy or hard, I've been thinking of scrapping this difficulty ranking system and just starting over. So I was wondering: if you rank your dances by difficulty, what is your system, what are your benchmarks for various difficulty levels, what sorts of things do you consider when determining the difficulty of a dance? If you DON'T rank your dances, why not?