The privacy manager sample disposition is specific to telephone surveys. Privacy manager services are telecommunications technologies that are available to households and businesses as an optional subscription from most local U.S. telephone companies. Many privacy manager services work with caller identification (caller ID) services to identify and block incoming calls that do not display a telephone number that the household has identified as a known number. Because very few households or businesses will have the name or telephone number of a telephone survey interviewing organization as a "known" number, privacy manager technologies make it significantly more difficult for telephone interviewers to contact households that subscribe to these services.

In addition to blocking calls from "unknown" numbers, most privacy manager services also block calls whose identification is ...