 The system originally considered only the technical difficulty of the hardest move on a route.For example, a route of mainly 5.7 moves but with one 5.11b move would be graded 5.11b and a climb that consisted of 5.11b moves all along its route would also be 5.11b.Modern application of climbing grades, especially on climbs at the upper end of the scale (>5.10), also consider how sustained or strenuous a climb is, in addition to the difficulty of the single hardest move.