Public Law 221 (P.L. 221) is Indiana’s comprehensive accountability system for K-12 education. Passed by the legislature in 1999 with broad bipartisan backing and the support of the business and education communities, the law aimed to establish major educational reform and accountability statewide. To measure progress, P.L. 221 places Indiana school corporations and schools into one of five categories based upon “improvement” and “performance” data from the Indiana Statewide Testing for Educational Progress-Plus (ISTEP+).