This document applies to the design of mobile access and working towers made of prefabricated elements with a height from 2,5 m to 12,0 m (indoors) and from 2,5 m to 8,0 m (outdoors).This document:-gives guidelines for the choice of the main dimensions and stabilizing methods;-gives safety and performance requirements; and-gives some information on complete towers.NOTEIn this document "indoors" means that the towers is not be exposed to wind, and "outdoors" means that the towers may be exposed to wind.