In the K-12 education sector, one of the primary uses of data is in state accountability systems. Many states now issue district and school report cards typically based on various performance metrics such as proficiency rates on standardized tests, absenteeism rates, and college and career readiness indicators. Unfortunately though, as James Leonard stated so eloquently in The New Philosophy for K-12 Education:
Absent an understanding of the type of variation present, any discussion of accountability is a burlesque!