 The Red List Index (sampled approach) (SRLI) has been developed in order to determine the threat status and also trends of lesser-known and less charismatic species groups.It is a collaboration between IUCN members and is coordinated through the Institute of Zoology (IoZ), the research division of the Zoological Society of London (ZSL).The SRLI is based on a representative sample of species selected from taxonomic groups within animals (invertebrates and vertebrates), fungi and plants.