Prior to 2011, AAPOR periodically surveyed current and former members and conference attendees to gain insight into member satisfaction and the value of benefits and programs. The previous membership survey, conducted in 2007-2008, was administered sequentially by Web-CASI with e-mail reminders, member reminders posted to AAPORnet, and a hardcopy questionnaire mailed to a random sample of 500 nonrespondents. The final response rates (AAPOR RR2) were 55.4% for the Member Survey and 30.2% for the Former Member Survey. Beginning with 2011, AAPOR resolved to conduct annual surveys with a more rigorous approach. To increase response rates, the Temple University Institute for Survey Research (ISR) mailed hardcopy questionnaires to all nonrespondents, added telephone reminders for everyone who did not complete a Web-CASI or mail survey, and offered a CATI option to all nonrespondents contacted by phone. The AAPOR Membership Committee also posted reminders via email, on AAPORnet, www.aapor.org, on Twitter, and on AAPOR’s Facebook and LinkedIn pages. The strategy resulted in final response rates (AAPOR RR1) of 60.8% for the Member Survey, 30.6% for the Former Member Survey, and 55% for the Non-Member Survey of Conference Attendees. Due to the multimode design, and because overall nonresponse and differential nonresponse between members, former members, and non-member conference attendees were key considerations in the 2011 Membership Survey, ISR developed standardized attempt codes to facilitate analysis of the resulting paradata within and between modes and membership groups. One interesting finding was the effectiveness of the telephone reminders in prompting Web-CASI completes paired with an unexpected lack of interest in completing the survey by phone. This presentation will report the results of the AAPOR Membership Committee’s nonresponse analysis, ISR’s analysis of the unified multimode case history paradata, and a joint analysis integrating the two components.