Study Search Results Your query returned 2 results. Series results are grouped under the most relevant study. You can ungroup series results. Results per page: 25 50 100 Sort by: Title A-Z Released/Updated Time Period Most Cited in ICPSR Bib. (?) Study Title/Investigator 1. Study of Instructional Improvement (SII) (ICPSR 26282) Loewenberg Ball, Deborah; Cohen, David K.; Rowan, Brian 2. Texas Higher Education Opportunity Project (ICPSR 29841) Tienda, Marta; Sullivan, Teresa A.