This paper describes research testing the Targeted Coverage Followup (TCFU) interview which will attempt to resolve instances of people who appear to have been counted twice in the census because of child custody arrangements, seasonal homes, moving, college or other similar situations. The research utilizes the cognitive interviewing method on a targeted convenience sample of respondents known to have multiple addresses. This report describes in detail the data we collected and discusses various issues with the TCFU form and recommendations for improvements for the next round of testing.