In the spring and summer of 2006, a large-scale test of the Census was carried out in preparation for the 2010 Census. The test included both Census operations and “Census Coverage Measurement” (CCM) operations. The CCM is conducted soon after the Census and its primary purpose in 2010 will be to measure two components of coverage error in the Census (omissions and erroneous enumerations, including duplications of households and people) and to inform efforts to improve the coverage of future censuses. The purpose of the CCM in the 2006 Census Test was not to measure coverage error, but rather to improve our methods for determining a person’s census day residence. There are several components to both the Census and CCM operations, and this report will discuss results of an evaluation of one such component: the CCM “Person Interview” (PI). The purpose of the PI is to collect information that can be used to determine whether anyone was missed or counted in error in the Census, and to assess whether those who were counted in the Census were enumerated at the correct address.