This assessment provides the results, statistics, and analyses from the 2010 Census Update/Leave operation. The qualitative information presented, such as recommendations, is based on insight from team members who were involved in the development and implementation of the operation. Quantitative analysis comes from the Decennial Statistical Studies Division, the Geography Division, and the Decennial Management Division, which collected and summarized assessment data from various sources after the operation was completed in April 2010. Approximately 9.1 percent of housing units and 46.1 percent of land area nationwide (including Puerto Rico) were covered by the Update/Leave operation.