When it is not possible or appropriate to use an exterior means (elevating platform, ladder, etc.), the arborist uses a rope progression technique. To do this, he sets up a rope from the ground and installs an ascending system which is determined by the configuration and height of the tree. Once the arborist is in position, he must stay balanced and comfortable (harness with attachment bridge and adjustable lanyards). The work positioning system should always be backed up during a cutting operation.