From New York Times:

This article uses various examples from school systems in New York, Oklahoma, and Texas to consider the relationships between charter and public schools. Charter schools were partially intended to serve as “test kitchens” for practices that could be exported into traditional public schools. Yet, two decades after charter schools began to appear, educators from both systems suggest that very little of what has worked for charter schools has appeared in regular classrooms. One reason for this lack of sharing might be competitive dynamics between schools that are fighting for the same students. Yet, some schools have worked together to improve teaching quality and principal training and some school districts have adopted practices embraced by charter schools, including longer school days, smaller high schools, and more autonomy for principals.