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ACORN (acronym for A Classification Of Residential Neighbourhoods) is a geodemographic information system categorising some United Kingdom postcodes into various types based upon census data and other information such as lifestyle surveys. It was developed by Richard Webber of CACI Limited, who also developed the competing MOSAIC system, and is sold to businesses, health and local authorities typically for marketing and planning purposes.
The population is divided into five categories from Wealthy Achievers (25.1%) to Hard Pressed (22.4%). They are also broken down into 17 categories from Wealthy Executives (8.6%) to Inner City Adversity (2.1%) and into 57 categories from Wealthy Mature Professionals, Large Houses (1.7%) to Multi-Ethnic, Crowded Flats (1.1%).
CACI's history as a pioneer in the field of geodemographics is echoed by their involvement in a geodemographics database hosted on the Compuserve Online Service back in the latter part of the 1980s, and it served the United States at first, rather than the United Kingdom. One could reach the service by entering the keywords "GO DEM". Their flagship product was entitled "Neighborhood Reports", which revealed information by US zip code. The service was oriented towards casual users and small business owners. Such outreaches toward marketing said material to the general public are commonly not made today. At this time, they were headquartered in Fairfax, Virginia.
- Compuserve Online Today, October 1987, Page 2