PEPCY developed a Decision Support Tool to help you assess the risk of cyanotoxin occurence in your setting, i.e. vice-versa the efficacy of your measures to control and prevent cyanotoxin occurrence. This also includes guidance for the management of such control measures. It covers the entire system, from catchment to consumer, and was tested by PEPCY partners in their local or national networks. This version of the tool is intended as a beginning, subject to further development, and is now being proposed for further development in the context of World Health Organization Guidance on Toxic Cyanobacteria. Your feed-back on its usefulness and coverage is therefor appreciated.