The Long Beach, Calif., school district has adopted a training system in which classroom teachers work collaboratively to improve teaching and learning, a shift from outsourcing professional development. "Our system is really invested in building internal capacity," said Jill Baker, the district's assistant superintendent for elementary and K-8, plus chief academic officer. "What that means is teachers become leaders and trainers. We're not bringing someone in from the outside. We're teaching teachers within to go back to their school sites to train others."