On Thursday, August 31, 2017, the people of Illinois woke up in the state that had the worst—as in least equitable—K-12 public education funding formula in the country. That night they went to bed in the state that had the best. This historic transformation happened because that afternoon, Governor Bruce Rauner signed Senate Bill (SB) 1947—which became Public Act (P.A.) 100-0465—into law. This breakthrough legislation incorporates the full “evidence-based model” (EBM) of school funding previously contained in SB 1.