The A.C.E. included a new operation to match P-sample and January 2000 MAF housing units prior to interviewing. The purpose of the match was to facilitate such operations as large block subsampling, telephone interviewing, and matching. Although the P-sample and census address lists were linked, independence was maintained because no changes were carried over from one list to the other as a consequence of the match.
The A.C.E. used computer-assisted telephone and personal interviewing (CATI/CAPI) to facilitate the accuracy of the information collected and the speed of data capture and processing. The PES used paper-and-pencil techniques throughout.
The A.C.E. clerical matching operation was conducted by clerks examining computerized P-sample responses and questionnaire images for census cases in the sampled block clusters. The technology was designed to be user friendly. Because of complete computerization of the operation, all matching could be done at one location, instead of seven as in 1990.
A major change from 1990 was the treatment of movers. The goal of the 1990 PES was to visit each P-sample address and find out where the current residents usually lived as of Census Day, April 1. This procedure is called PES-B, which requires collecting Census Day address information for inmovers (people resident at the P-sample address on interview day but not on Census Day) and searching nationwide to determine if they were enumerated or missed at their reported Census Day residences.11 The original design for Integrated Coverage Measurement for 2000 ruled out PES-B because of the plan to use sampling for nonresponse follow-up, which meant that movers might not match because their Census Day addresses did not fall into the nonresponse follow-up sample. This decision was carried over to A.C.E.
The 2000 A.C.E. had two goals: to find out who lived at each P-sample address on Census Day and determine whether they were enumerated or missed in the census at that address and to find out who lived at each P-sample address as of the A.C.E. interview day. This procedure is called PES-C; it results in