"EICAT classifies taxa into eight categories based on: whether they have been assessed using EICAT; their alien status; impact data availability; and impact magnitude (IUCN 2020a, b). The EICAT categories are: Not Evaluated (NE): Taxa which have not been assessed using the EICAT protocol. No Alien Populations (NA): Taxa which have not been introduced to areas outside of their native range. Data Deficient (DD): Alien taxa which have been assessed using the EICAT protocol, but for which no data were available to classify them. Minimal Concern (MC): Alien taxa which have been assessed using the EICAT protocol and that do not affect the performance of native taxa (i.e. their impacts to native taxa are negligible). Minor (MN): Alien taxa which affect the performance of native taxa, but for which there is no evidence to suggest that they lead to decreased population sizes of any native taxon. Moderate (MO): Alien taxa which have been shown to adversely affect native taxa population size, but which have not caused the local disappearance of any native taxon. Major (MR): Alien taxa which have caused the reversible local population extinction of at least one native taxon. Massive (MV): Alien taxa which have caused the irreversible local population extinction of at least one native taxon. MC, MN, MO, MR and MV are the EICAT impact categories. The three highest magnitudes (MO, MR and MV) are termed “harmful” under EICAT."