Web surveys are increasingly being adopted by survey organizations as an alternative to mail and telephone surveys. While there is a growing body of literature on respondent behavior to Web-only surveys, little is known about the charactistics of Web respondents in multimode surveys. The purpose of this paper is to profile the Web respondents to the National Survey oCof Recent College Graduates (NSRCG), a biennial survey of recent bachelor's and master's degree recipients in science, engineering, and health. In 2003, the NSRCG was conducted as a mail survey with the option to complete the survey on the Web or by telephone. This paper describes (1) who selfselected into the Web mode and how they differ from respondents to the other modes in terms of gender, race/ethnicity, age, degree field, employment status, and occupation; (2) patterns of Web behavior including login days and times; (3) interactions with email reminders, incentive offers, and other contacts, and (4) the incidence of "lurkers," that is, people who view the Web survey but do not complete it. Depending on the development costs and number of respondents, interviews completed by Web are potentially less expensive than mail or telephone interviews. The paper concludes with recommendations for maximizing Web responses in a multimode environment.