IUCN, the International Union for Conservation of Nature

• The IUCN Red List Process
• Guidelines for the appropriate use of Red List data (2009)
• The IUCN Red List Categories and Criteria (version 3.1 second edition)  is available in English, Français  and Español
• Guidelines for using the IUCN Red List Categories and Criteria   – this document provides further guidance on how to apply the IUCN Red List Categories and Criteria. Please note that these guidelines are reviewed annually and users should check this web site to ensure that they have the current version of the guidelines before carrying out Red List assessments.
• Documentation Standards and Consistency Checks for IUCN Red List Assessments and Species Accounts  - This document provides guidance on the documentation standards for Red List assessments and consistency checks that should be carried out before submitting assessments for inclusion in the IUCN Red List of Threatened Species. These guidance notes are particularly relevant to entering information into the IUCN Species Information Service (SIS) and should be used for reference when preparing Red List assessment accounts. Please note that this is a working document and will be updated - users should check these pages regularly for new versions.
• Criterion A examples workbook – This Excel file has two worksheets related to calculation of population reduction under IUCN Red List Criteria A1-A4. These examples are intended for use in conjunction with the IUCN Red List Categories and Criteria (version 3.1) and the associated guidelines document.
• Generation Length workbook
• Guidelines for Application of IUCN Red List Criteria at Regional Levels
• Classification schemes for habitats, threats and conservation actions  In order to ensure global uniformity when describing the habitat in which a taxon occurs, the threats to a taxon, what conservation measures are in place or are needed, and whether or not the taxon is utilized, a set of standard terms (called Classification Schemes; formerly referred to as Authority Files) have been developed for documenting taxa on the IUCN Red List.
• The IUCN Red List Petitions Process
• Terms of Reference for Red List Authorities

Red List Indices have been produced which chart overall changes in the threat status of the world's amphibians, birds, corals and mammals. These are based on the number of species that moved between categories as a result of genuine changes in threat status (excluding moves resulting from improved knowledge or taxonomic changes). The IUCN Red List Programme will improve the taxonomic coverage of the Red List Indices in the coming years as they are central to monitoring the progress of global efforts to reduce biodiversity loss.

• The IUCN Red List Index: Guidelines for national and regional use
• Measuring Global Trends in the Status of Biodiversity: Red List Indices for Birds (Butchart et al. 2004) - paper published in PloS Biology
• Using Red List Indices To Measure Progress Towards the 2010 Target and Beyond (Butchart et al. 2005) - paper published in Philosophical Transactions of the Royal Society

• Criteria Review Scoping workshop report (2-3 March 1998, London, UK)
• Marine workshop report(16-17 January 1999, Tokyo, Japan)
• Criterion B: Range Areas and Uncertainty Workshop report (3-5 May 1999, Sydney, Australia)
• Draft of the proposed changes and recommendations (article in Species issue 31/32, 1999)

• Guidelines for Application of IUCN Red List Criteria at Regional Levels
• Analysis of the Application of IUCN Red List Criteria at the National Level: report from the ational Red List Advisory Group Workshop (21-26 January 2005, Venezuela) ( 481 KB)
• Use of the IUCN Red List Criteria in national threatened species listing: Original survey ; Survey report