This paper documents the multistep procedure used by the Louisiana Department of Education, Bureau of School Accountability to correct and verify the data that drive the state's statewide school performance indicator program, the "Progress Profiles." The paper also reports the findings of a nationwide survey in which state departments of education describe their data-verification procedures. To correct problems identified with the first "Profiles," new data collection and aggregation procedures were developed, beginning with educating staff about the importance of quality data. A second initiative was to involve the department staff and the owners and users of data in the verification and correction of raw and aggregated data. Profile coordinators were used to coordinate data verification and correction efforts, and reports were prepared with raw data for each local education agency (LEA). Each LEA reviewed raw data reports for correctness. The 50 states were surveyed about the procedures they follow in verifying data, and 42 states replied with descriptions of their procedures. In general, edit checks are performed on collected data, and data are returned to LEAs if discrepancies are found. In Louisiana, the verification process appears to have improved attendance and dropout data, but has not had the same impact on suspension and expulsion data. The upcoming Student Information System should further improve data quality. Three tables are included. (Contains 4 references.) (SLD)