This document proposes a harmonized risk assessment procedure as basis for permissions of in-water cleaning (IWC) of ships in the Baltic Sea Region by taking into account three relevant environmental aspects of IWC: I) Risk of species introduction (biosecurity risk), II) Risk of biocide input and III) Risk of particle input. The risk assessment concept bases on experiences from the COMPLETE PLUS project but also on experiments performed in other research studies from all over the world.