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Type A - A small elite at the top, very few people in the middle and the great mass of people at the bottom.
Type B - A society like a pyramid with a small elite at the top, more people in the middle, and most at the bottom.
Type C - A pyramid except that just a few people are at the bottom.
Type D - A society with most people in the middle.
Type E - Many people near the top, and only a few near the bottom.
Universe
Adults (18 and over) living in private households in Great Britain (excluding the 'crofting counties' north of the Caledonian Canal).<br>;Adults;National
Sampling
Multi-stage stratified random sample;Sampling is conducted in four stages; from 1993 the sample has been drawn from the Postcode Address File, whereas in previous years it was drawn from the Electoral Register.
Study Type
Repeated cross-sectional study. The BSA survey is conducted annually.