Grade 1: Trekking in altitudes less than 3000 meters, but involving considerable up and down-hill walking on mountain trails for 5-6 hours a day.

Grade 2: Moderate trekking to altitudes between 2000 - 3000 meters, possibly Including brief excursions or pass crossings of up to about 4500 meters.

Grade 3: Moderate trekking to altitudes of 3000 - 4000 meters, generally including strenuous excursions or pass crossings of up to 5500 meters.

Grade 4: Rigorous trekking to altitudes predominantly above 4000 meters, with excursions, pass crossings or peak climbing. Elementary knowledge of the use of crampons and ice axe is desirable. Some climbing experience may be required for peak climbing.