This article tests the hypothesis that children's learning environment will improve through a social and emotional learning (SEL) intervention that provides preschool teachers with new skills to manage children's disruptive behavior by reporting results from the Foundations of Learning (FOL) Demonstration, a place-randomized, experimental…

out new ideas within their own classroom contexts and with the help of skilled colleagues. Professional development from this perspective, therefore, not only involves teachers attending training sessions such as workshops or conferences but also receiving on-site technical assistance and mentoring in new instructional techniques. To ensure that…