This study explores the impact of professional learning communities on student achievement in a small school setting. Aaron Hansen's book, "How to Develop PLCs for Singletons and Small Schools," offered a guide for arranging vertical, grade-level teams with one teacher per grade level at one private, K-8 school. The faculty engaged in…

Background: Prior research shows that teachers' working conditions are important for teacher and student outcomes, such as teacher retention and student achievement. Because National Board Certified Teachers (NBCTs) can be effective in the classroom and as instructional leaders, they are well positioned to create favorable working conditions for…

Background: Cluster-randomized experiments that assign intact groups such as schools or school districts to treatment conditions are increasingly common in educational research. Such experiments are inherently multilevel designs whose sensitivity (statistical power and precision of estimates) depends on the variance decomposition across levels.…