Much survey research has been directed at studying interviewer-administered questionnaires. As a result, we have learned a great deal about question wording and sequencing effects in surveys and about the effect of memory on data quality (e.g., Jobe et al, 1993; Jobe et al., 1990; Lessler, 1989; Converse and Presser, 1986; Belson, W., 1981). Although it is equally important to understand these sources of error in self-administered questionnaires, it is not sufficient. The graphical presentation of information is every bit as important because it too has something to say to the respondent.