http://www.washingtonpost.com/ac2/wp...43295-2001Jun8
"...The reason so many wrong names ended up on the scrub list is that Florida ordered ChoicePoint to input questionably broad matching criteria into its sophisticated computer programs. According to various statements by ChoicePoint officials, the criteria were: First four letters of the first name. Middle initial. Gender. At least 80 percent of the letters in the last name. Approximate date of birth. Last four digits of Social Security number when available -- which was not often, since fewer than 10 percent of Floridians had that number on their voter registration forms. Certain variations were also programmed in (Willie could match William; John Richard could match Richard John)..."