The objective of this workshop is to convene the first group of "ecosystem red list assessors" to share their experience with the implementation of the proposed categories and criteria for the IUCN Red List of Ecosystems. Examples will be drawn from different regions of the world, various ecosystem types, and contrasting institutional settings. When used in tandem with species red lists, ecosystem red lists could provide the most informative indicator to date of the status of biological and abiotic diversity. In addition to informing about the IUCN Red List of Ecosystem process, and reporting on the application of the categories and criteria through case studies, a portion of the workshop will be devoted to working with participants on the analysis of a real data set. We will also show participants how to take advantage of a series of resources to be made available through a website, and ask them to join our Facebook page to become actively involved in the initiative.