According to Dr. Hattie, collective efficacy (the belief that together we are responsible for and are able to positively impact student learning) is the single most powerful lever in increasing student achievement, overcoming even socio-economic factors in education. Effective instructional teams (any team that meets regularly for the purpose of learning together to increase student achievement) embody a culture of collective efficacy leading to a focus on improving common instructional practice resulting in increased student achievement for all. Listen to Jennifer Crockett, Kim Duenas, and Amy Pendray of Long Beach Unified discuss their learning about what makes collective efficacy such a powerful force.