The Encyclopedia of Prehistory represents also defined bya somewhatdifferent set of an attempt to provide basic information sociocultural characteristics than are eth on all archaeologically known cultures, nological cultures. Major traditions are covering the entire globe and the entire defined based on common subsistence prehistory ofhumankind. It is designed as practices, sociopolitical organization, and a tool to assist in doing comparative materialindustries,butlanguage,ideology, research on the peoples of the past. Most and kinship ties play little or no part in of the entries are written by the world's their definition because they are virtually foremost experts on the particular areas unrecoverable from archaeological con and time periods. texts. In contrast, language, ideology, and The Encyclopedia is organized accord kinship ties are central to defining ethno ing to major traditions. A major tradition logical cultures. is defined as a group ofpopulations sharing There are three types ofentries in the similar subsistence practices, technology, Encyclopedia: the major tradition entry, and forms of sociopolitical organization, the regional subtradition entry, and the which are spatially contiguous over a rela site entry. Each contains different types of tively large area and which endure tempo information, and each is intended to be rally for a relatively long period. Minimal used in a different way.