Teachers who cannot understand pupils' tastes in music and clothes now have a handy guide from a yoof-conscious Government.
The report examines 10 teenage "tribes": Indies, Moshers, Sporties, Trendies, Townies, Geeks, Scallies, Gangstas, Skaters and Goths. Many are easily identifiable. Goths, with their penchant for black clothes and gloomy music, are simple to distinguish from hip-hop-loving Gangstas, who, the report stresses, are not usually criminals.
"A preference for hip-hop ... may not define completely which tribe a young person belongs to but the music at a gig full of Goths will undoubtedly sound different from that populated mainly by Gangstas," the report states.
The study, based on a survey of 1,000 teenagers, suggests the greatest range of tribes can be found in the South-east. "The majority of Indies, Moshers, Sporties, Trendies and Townies come from the region," it states. Geeks and Scallies are found in the North-west, Gangstas in London, Skaters in the Midlands and Goths in the Eastern Counties.
There are also sub-tribes such as Smellies, a sub-species of Mosher, who like even heavier metal.
Dr Peter Marsh, a psychologist and director of the Social Issues Research Centre in Oxford, was commissioned to write the report for FRANK, a state-funded drugs information service.
The study's chief finding was that one in five teenagers believed friends had pretended to take drugs to impress others. Perhaps unsurprisingly, Gangstas were most likely to show off in this way.