This quality profile presents the results of the 2010 Census Coverage Measurement Initial Housing Unit Followup Quality Assurance Program. Before the Initial Housing Unit Followup Operation began, the Census Coverage Measurement sample size was reduced. This operational sample reduction was a result of an initiative from the Director of the U.S. Census Bureau to reduce nonsampling error in the Census Coverage Measurement Program.

The Initial Housing Unit Followup field operation, along with its Quality Assurance components, occurred from March 4, 2010 to May 5, 2010 after the Census Coverage Measurement Initial Housing Unit Computer Matching and Before Followup Clerical Matching operations. Its purpose was to reconcile inconsistencies found between the Census Coverage Measurement and Census address lists during these initial matching operations. Inconsistencies included:

• Census Coverage Measurement addresses that did not match to a Census address,
• Census addresses that did not match to a Census Coverage Measurement address,
• possible duplications of addresses within either list,
• Census Coverage Measurement housing units with an unresolved unit status,
• Census Coverage Measurement housing units that matched or possibly matched a housing unit in a surrounding block of the block cluster
• Census group quarters or other living quarters that matched or possibly matched to a Census Coverage Measurement housing unit.

Each inconsistency required a specific followup interview of the housing unit(s) in disagreement. The interview for each followup housing unit or group of housing units, if the units were possible matches/duplications, made up a followup case form. A block cluster’s Initial Housing Unit Followup packet was comprised of all followup case forms in that block cluster. The objectives of the followup interview were to collect additional information meant to facilitate the After Followup Clerical Matching to create an accurate listing of Census Coverage Measurement housing units in a block cluster, and to link different versions of an address appearing on the Census Coverage Measurement and/or Census lists. The result of the Initial Housing Unit Followup field operation was updated information on the followup cases to reconcile identified discrepancies, and after further clerical matching, an updated listing of Census Coverage Measurement housing units in the sample areas. This updated list comprised the Census Coverage Measurement’s sample and was used as the basis for the inventory of Census Coverage Measurement housing units to interview for the Census Coverage Measurement Person Interview field operation. Of the 6,416 block clusters remaining in the reduced Census Coverage Measurement sample, 4,932 block clusters had one or more housing units that were sent to Initial Housing Unit Followup for resolution.