The Australian Soil Classification provides both a framework for organizing knowledge about Australian soils and a means of communication among scientists and land managers. This second edition includes updates from a working group of the National Committee on Soils and Terrain. Modifications include expanding the classification to incorporate different kinds of sulfidic materials, the introduction of subaqueous soils as well as new Vertosol subgroups, new Hydrosol family criteria and the consistent use of the term reticulate.