Students listen to a news conference at St. Peter the Apostle Catholic Church on April 23 in Philadelphia. Archbishop of Philadelphia, Charles Chaput, and Mayor Michael Nutter were speaking at an event for The Great Schools Compact, an effort to identify and replicate best practices at the city's highest-performing schools.

Students listen to a news conference at St. Peter the Apostle Catholic Church on April 23 in Philadelphia. Archbishop of Philadelphia, Charles Chaput, signed The Great Schools Compact, which is an effort to identify and replicate best practices at the city's highest-performing schools.

Archbishop of Philadelphia, Charles Chaput, center, signs The Great Schools Compact as Philadelphia Mayor Michael Nutter and students watch during a news conference at St. Peter the Apostle Catholic Church on April 23 in Philadelphia. Chaput signed the compact, which has already received a planning grant and will compete for an implementation grant the Bill & Melinda Gates Foundation.

Archbishop of Philadelphia, Charles Chaput, left, and Philadelphia Mayor Michael Nutter, meet during a news conference at St. Peter the Apostle Catholic Church on April 23 in Philadelphia. Chaput signed The Great Schools Compact which is an effort to identify and replicate best practices at the city's highest-performing schools, regardless of whether they are charter or district-operated or Catholic schools.