Collaborative learning teams are improving teacher practice and student learning results in the Dallas Center-Grimes Community School District near Des Moines, Iowa. Since 2009, all teachers and principals in the district have participated in collaborative learning teams to study a process known as assessment for learning, in which formative…

School-based learning depends on teachers' capacity to engage with each other around central issues of teaching and learning. While such collaboration is readily welcomed by some educators, others remain wedded to an "independent contractor" concept of teaching. Supporting teachers to view themselves as team members and to perform effectively as a…