Howes, C., Pianta, R., Bryant, D., Hamre, B., Downer, J., & Soliday Hong, S. L. (2011). Ensuring effective teaching in early childhood education through linked professional development systems, quality rating systems and state competencies: The role of research in an evidence-driven system. In C. Howes & R. Pianta (Eds.), Foundations for teaching excellence: Connecting early childhood quality rating, professional development, and competency systems in states (pp. 151-170). Baltimore, MD: Brookes.