0000315066-01-000004 SC 13G/A 1 20010110 ACNIELSEN CORP 0001019878 8700 061454128 DE 1231 SC 13G/A 34 005-47591 1505639 177 BROAD STREET STAMFORD CT 06901 2038344200 177 BROAD ST STAMFORD CT 06901 FMR CORP 0000315066 0000 161144965 MA 1231 SC 13G/A 82 DEVONSHIRE ST BOSTON MA 02109 6175706339 82 DEVONSHIRE STREET BOSTON MA 02109 SC 13G/A 1 0001.txt SCHEDULE 13G - 01-10-01 - ACNIELSEN CORPORATION