 For example, the North America Wall on El Capitan would be classed "VI, 5.8, A5[2]", or Medlicott Dome – Bachar/Yerian 5.11c (X,***)

The system consists of five classes indicating the technical difficulty of the hardest section.Class 1 is the easiest and consists of walking on even terrain.Class 5 is climbing on vertical or near-vertical rock, and requires skill and a rope to proceed safely.