A study assessed the relative effectiveness of four types of follow-up techniques in increasing responses to mailed questionnaires requiring responses from multiple individuals. The respondents were college administrators. Copies of questionnaires designed to measure professional development were mailed to a random sample of 693 chief student affairs officers who were members of the National Association of School Personnel Administrators. The subjects were asked to complete and return the measure and forward a copy to their supervisor and to the student government president for completion and return. A total of 91 subjects responded to the initial mailing, and 113 subjects indicated an inability or unwillingness to participate in the study, leaving 344 subjects available for the study on follow-up approaches. Follow-up methods chosen included: (1) a postcard requesting a response; (2) an individually addressed letter typed on letterhead; (3) a photocopied "Dear Colleague" letter; and (4) telephone calls. In addition to requesting a response, each method included an offer to forward another set of survey materials. Results indicate that the degree of personalization and reduction of costs for the subjects' responses were the most salient factors in each method's success. (TJH)