ABSTRACT
René Caissy, a climbing instructor, has the habit of saying to his climbing students: “Th e aim of this exercise is to help you to plan a useful strategy for climbing, without interruption, in a fl uid way. Of course, you will be surprised
by the diff erence between your projected ascent and your realized ascent. Th is gap comes from your limited knowledge about your available resources and your gestural possibilities. Nevertheless, to read the path is an asset, even if it represents only a mental help.”
