Edited sentence: In a September 2007 public policy report, education experts Andrew Rotherham and Sara Mead of Education Sector offered a series of recommendations to improve charter schools through increased accountability.Some of their recommendations were to: (i) provide more public oversight of charter school authorizers, including the removal of poor-quality authorizers, (ii) improve the quality of student performance data with more longitudinal student-linked data and multiple measures of school performance, and (iii) clarify state laws related to charter school closure, especially the treatment of displaced students