Many climbing routes have grades to calibrate the technical difficulty, and in some cases the risks, of the route to the climber. The first ascensionist can suggest a grade but it will be amended for
Action Directe was a major milestone in free climbing grades when Wolfgang Güllich freed it in 1991 at 9a (French), 5.14d (American YDS), XI (UIAA).
The six levels (Grade I–VI) of the "Welzenbach scale", from 1926
Adam Ondra on the sport climbing route Silence, one of the hardest free climbing routes in the world and the first-ever proposed at 9c (French), 5.15d (American YDS), and XII+ (UIAA).
Alex Honnold's 2017 free solo of Freerider on El Capitan was the first-ever big-wall free solo at the grade of 5.13a (American) or 7c+ (French)
Climbing technique refers to a broad range of physical movements used in the activity or sport of climbing.
Illustration from a 1924 textbook by Ernst Platz [de]