The newest methods of survey data collection to emerge have reduced the role of the interviewer or eliminated it entirely, allowing the respondents to interact directly with the computer. The new modes of self-administered data collection include Web surveys and a technology referred to as interactive voice response (IVR) in which the computer plays a recording of the questions to the respondents over the telephone, who indicate their answers by pressing keys on the handsets. The Gallup Organization uses IVR to collect data for a broad range of clients. In 1999 alone, Gallup completed more than 1 million IVR interviews, generally brief ones assessing customer satisfaction. It addition, it has carried out several experiments comparing data collect by IVR with data from other modes of data collection. This paper describes the results of four experiments done at Gallup in 1998 and 1999 comparing data collected by IVR from other modes of data collection. Three of the four studies focus on the impact of IVR on reporting; the fourth focuses on the effects of IVR on nonresponse.