Changes or improvements from one year of a  survey to the next are common in any ongoing  survey operation.  Some changes or improvement s can result in apparent differences between  two years that subject matter experts identify  as potentially more influenced by the survey  changes rather than by actual change in the  item measured. The American Community Survey  implemented a variety of changes in the 2008 qu estionnaire. These changes may have impacted  the estimates of several variables, specifically  the estimates of Hispanic origin type, nativity,  race, and language spoken at home.  This docum ent is intended to provide data users with  information on the changes observed between  the 2007 and 2008 data for these selected  variables, and to illustrate th e impact on the observed differences  between the annual results that  may be attributable to the surv ey changes.  As a result, we  recommend that data users should  treat the measured change between  the 2007 and 2008 results with caution.