Sharon Castle is associate professor of elementary education at George Mason University in Fairfax, Virginia. She has been heavily involved in research and development of Professional Development Schools and performance-based assessment of teacher candidates. She is a member of the NCATE Board of Examiners. Beverly D. Shaklee is a professor of curriculum & instruction and director of the Center for International Education at George Mason University in Fairfax, Virginia. She is well known for her work in performance assessment and gifted education, both in the United States and internationally.