AT&T Co, Basking Ridge, New Jersey wants to reduce the number of its vast computer centres that process its long-distance telephone accounting, engineering and marketing around the US to seven from the present 12, putting about 1,000 jobs in jeopardy at the centres to close: it hopes to save $70m a year from the closures, which are to be made by 1992; the ones to close are Cincinnati; Greensboro; Hamilton Township, New Jersey; Oakton, Virginia; and Fairhaven, Massachusetts and it hopes to achieve the closures without lay-offs; the remaining computer centres will be in Denver; Alpharetta; Kansas City, Missouri; Mesa; Orlando; and Bridgewater and Knightsbridge, New Jersey; it has already shut 10 such bases since 1987, and employment in information management services is now 7,400, from 7,700 in 1987.