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.