The universal lightweight formwork for walls, foundations, columns and slabs. The system is characterized by the extremely simple handling and the minimum number of different system components. Almost all operations with DUO can be carried out without tools while the working steps are very easy to understand. Even those less experienced users of system formwork can work quickly and efficiently with DUO. New is not only the concept but also, in particular, the material used. Both the panels- including the formwork - and the DUO accessories are made of technical polymers. Due to the low weight, no crane is required for assembly operations.