The International French Adjectival System (IFAS) is an overall rating of alpine and ice climbs used primarily in the Alps. It expresses the seriousness of the route, including factors such as length, objective danger, how sustained it is, commitment, altitude, runouts, descent, and technical difficulty in terms of terrain. It has six categories that are symbolized by the first one or two letters of the French adjective used. It is further subdivided with the use of ( + ) or (-) or sup (superior) or inf (inferior).
F: Facile = easy. Steep walking routes, rock scrambling, and easy snow slopes. Crevasses possible on glaciers. Rope not always necessary. PD: Peu difficile = moderate. Rock climbing with some technical difficulty, snow and ice slopes, difficult glaciers, and narrow ridges. AD: Assez difficile = fairly hard. Fairly difficult and serious climbs, steep rock climbing, long snow/ice slopes above 50 degrees. D: Difficile = hard. Sustained hard rock and snow/ice climbing.
TD: Très difficile = very hard. Very difficult technical climbing on all kinds of terrain. ED: Extrêmement difficile = extremely difficult. Extremely serious climbs with long sustained difficulties of the highest order. ABO: Abominable
The Soviet Union has an alpine rating system somewhat comparable to the NCCS system used in the United States. The scale is 1-6, with a and b subdivisions.
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