The Northwest Invasive Plant Council (NWIPC) is currently targeting 73 invasive plants for management, as per the NWIPC 2016 Target Plant List. The list of species is reviewed, updated and approved by the membership every spring at the annual general meeting. On the list, each plant is rated by the NWIPC as to its potential invasiveness, and corresponding management at the site level is recommended. The strategy for determining which plants to target is based on a number of factors, such as whether or not they are already present in the region, their habitat range and aggressiveness, as well as current scientific advice. See the current NWIPC Strategic Plan for more information (note - the Strategic Plan is not updated on an annual basis).