Some 9.5 million Americans now use the Internet , including 8.4 million adults and 1.1 million children under 18, who tap into it from the workplace, school and homes, according to findings from the American Internet User Survey, a just completed study by FIND/SVP. The study culminates a year and a half of intensive research and development. The American Internet User Survey was fielded by telephone in November and December to 1,000 randomly dialed Internet users. It was preceded by focus groups and a series of online surveys, and represents the fourth time FIND/SVP has studied Internet users by telephone in the past 18 months. This makes FIND/SVP the only firm with historical random sampled data, enabling Internet usage behavioral tracking since 1994.