It prevailed internationally and was renamed in 1968 as the UIAA scale.
Originally a 6-grade scale, it has been officially open-ended since 1979.
In 1923, the German mountaineer Willo Welzenbach compressed the scale and turned the order around, so that level 00 became level IV–V.
This "Welzenbach scale" was adopted in 1935 by French mountaineers like Lucien Devies, Pierre Allain and Armand Charlet for routes in the Western Alps and finally in 1947 in Chamonix by the Union Internationale des Associations d'Alpinisme.
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They include: The Yosemite Decimal System (YDS) of grading routes was initially developed as the Sierra Club grading system in the 1930s to rate hikes and climbs in the Sierra Nevada range.
There are a number of factors that contribute to the difficulty of a climb, including the technical difficulty of the moves, the strength, stamina and level of commitment required, and the difficulty of protecting the climber.
Different grading systems consider these factors in different ways, so no two grading systems have an exact one-to-one correspondence. They may be the opinion of one or a few climbers, often the first ascensionist or the author(s) of a guidebook.
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