Design assignment within the water and sewage sector (W&S), including necessary ancillary subjects beyond W&S such as as geotechnics, rock geology, road/traffic, building technology, landscape/stream, electrical and [knowledge of the] Planning and Building Act. The framework agreement can be used in all phases of study, design, supervision of construction time, independent inspection, construction management and search function. All manner of W&S transport and retention systems and stations can be called-off, both new facilities and renovation, as well as both trench construction and trenchless construction.