This is the final report on development, cognitive testing, and revision of the experimental 2010 CPEX Over count booklet with a new sequence of overcount questions conducted in 2008-2009. This booklet is intended for use in the Census 2010 split -panel Alternative Questionnaire Experiment “Avoid Followup Evaluation.” The objective of the experimental overcount question sequence is to collect the critical information needed to make it possible to determine, from the answers on the census form itself during processing, where each person should be counted. If it works, this experimental booklet has the potential to improve the accuracy of where persons are counted as well as cut the costs and time involved in conducting telephone followup operations several months later.