NatureServe Invasive Species Protocol

http://www.natureserve.org/library/invasiveSpeciesAssessmentProtocol.pdf

NatureServe, in cooperation with The Nature Conservancy and the U.S. National Park Service, developed this Invasive Species Assessment Protocol as a tool for assessing, categorizing, and listing non-native invasive vascular plants according to their impact on native species and natural biodiversity in a large geographical area such as a nation, state, province, or ecological region.