Inventory – To create a catalog by identifying, mapping, surveying, rating and classifying based on threat level, probability of successful control efforts, present distribution and recommended management action. Inventory ratings reflect importance of the pest, the likelihood that eradication and control efforts will be successful, and the present distribution of the pest.

Invasive Species – Species, both aquatic and terrestrial, that establish and reproduce rapidly outside of their native range and may threaten the diversity or abundance of native species through competition for  resources, predation, parasitism, hybridization with native populations, introduction of pathogens, or physical or chemical alteration of the invaded habitat.

The Lake Tahoe Basin Invasive Weed Coordinating Group and the Lake Tahoe Aquatic Invasive Species Coordinating Committee conduct or coordinate annual invasive species inventories in the Tahoe Basin in accordance with the Lake Tahoe Regional AIS Management Plan and other reports. These groups report results from annual inventories into the EIP Database either by December 31st of each reporting year or as individual inventories are completed throughout the year. 

The areas inventoried for invasive species are often much larger than the areas that are infested, which are tracked under the New Invasive Species Locations Detected Performance Measure.