The following scale reflects the difficulty of the climb considering the technical specifications, experience required, altitude and duration of the ascent. The grades are roughly estimated and you have to take into account the difficulty varies depending on your personal fitness and experience.

Intermediate - No previous mountaineering skills are required. Climbers should be in acceptable physical condition and it is highly recommended that participants have some backpacking experience. In some cases a rope may be used to belay some exposed places.

Advanced - Basic mountaineering skills required, experience in high altitude and use of climbing gear such as crampons, rope and ice axe is preferred, but not required. A moderate climb usually is on a glacier, you may have to cross some crevasses, the slopes are not so steep (max. 40%) and full gear is used on all climbs. Very good physical condition is required.

Strenuous - More than 6.000 m / 19,600 ft technical climbs with steep snow slopes and exposed ridges, you may encounter some crevassed sections. Experience in high altitude and proper use of equipment as well as some knowledge of mountaineering techniques are required. Climbers should be comfortable on snow and ice up to 50 degrees. An excellent physical condition is a must.