Study Search Results Your query returned 2 results. Use the search box below to revise your search, or start a new search. Results per page: 25 50 100 Sort by: Title A-Z Released/Updated Time Period Most Cited in ICPSR Bib. (?) Study Title/Investigator 1. Head Start Impact Study (HSIS), 2002-2006 [United States] (ICPSR 29462) United States Department of Health and Human Services. Administration for Children and Families. Office of Planning, Research and Evaluation 2. Third Grade Follow-up to the Head Start Impact Study (HSIS), 2007-2008, United States (ICPSR 35003) Puma, Michael; Bell, Stephen; Cook, Ronna; et al.