Since 2006 the national Study of Education Data Systems and Decision Making, sponsored by the U.S. Department of Education's Policy and Program Studies Service, has been examining both the implementation of student data systems per se and the broader set of practices involving the use of data to improve instruction, regardless of whether or not the data are stored in and accessed through an electronic system. The study's data collections included a national survey of districts in spring 2007 and site visits during school years 2006-07 and 2007-08 to a purposive sample of districts and schools selected on the basis of their active involvement in the use of data for instructional improvement. The study team also conducted secondary analyses of national teacher survey responses to questions concerning data system access and use. Earlier study reports have documented a dramatic increase in the proportion of teachers with access to a student data system between 2005 and 2007 and described school practices with respect to data use and the challenges that are part of student data system implementation. This final report builds on the picture of local practices in implementing data-driven decision making provided in the earlier reports by presenting data from the national district survey as well as from site visits conducted during 2007-08 at 36 schools in 12 districts. Key findings from surveys and site visits with respect to district data systems and strategies for supporting the use of data in instructional decision making are described in this report. Appendices include: (1) Methods; (2) 2007-08 District Survey and Frequencies; and (3) Terminology and Additional Data. (Contains 59 exhibits and 36 footnotes.)