On the 16th of December 2019, the National Center for Environment and Sustainable Development (#NCESD) organized the 2nd Regional Meeting, with the subject "Regional case studies on eradication, control and mitigation impact methods of Invasive Alien Species" in Athens. In the meeting the #NCESD presented the #INVALIS project and discussed the need to adopt measures against these species. They also unanimously argued that they must take into account specific criteria when they choose the most appropriate treatment methods (e.g. biology of the species, biogeography of habitat, reversal of positive and negative effects and also economic criteria).