The National Education Research and Development Centers are funded through IES's NCER. The mission of the R&D Centers is to contribute to the production and dissemination of rigorous evidence and products that provide practical solutions to important education problems in the United States. The R&D Centers achieve this mission by developing, testing, and disseminating new approaches to improve teaching and learning, and ultimately, student achievement. Each of the Centers conducts a focused program of education research in its topic area. In addition, each Center works cooperatively with NCER, conducts supplemental research within its broad topic area, and provides national leadership in defining research and development directions within its topic area. Currently, there are 10 active National R&D Centers and 15 completed National R&D Centers.