The purpose of this study was to assess differences in demographic variables, mean attitude score, reliability of response, variability of response, and level of item completion among respondents to an initial survey mailing, to the first follow-up, to the second follow-up, and to a telephone interview. The first mailing included a cover letter, the survey instrument, and a stamped, self-addressed return envelope. Subjects were 600 inservice elementary and secondary school teachers from Wyoming and Nebraska (300 from each state). The first follow-up consisted of a reminder letter. The second follow-up consisted of a cover letter, a second copy of the survey, and a stamped, self-addressed return envelope. The first and second follow-ups were undertaken, respectively, 3 and 6 weeks following the initial mailing. Sixteen of the 600 envelopes sent out at the first mailing were undeliverable, leaving an effective sample of 584. The final response rate to the mail questionnaire was 71.2%; 25 non-respondents were interviewed by telephone. The probability of Type I error set for this study was p=0.20. Results suggest that small differences in data quality and attitude-behavior exist across waves, with reluctant respondents having fewer positive attitudes toward the topic and less favorable views of themselves as researchers and teachers. Three data tables are included. (Author/TJH)