At a glance: A-F reform timeline - Article Photos 1/6

Oklahoma City Public Schools Superintendent Karl Springer, left, Edmond Superintendent Dr. David Goin, and Union Superintendent Cathy Burden speak Thursday, Oct. 4, 2012, during a news conference as school chiefs from across the state are meeting in Oklahoma City to express concern and frustration about the A-F school evaluation reform. Photo By Paul Hellstern, The Oklahoman PAUL HELLSTERN - Oklahoman