(Lesh, Kelly, & Yoon, in press)

Lesh, R. A., Kelly, A. E., & Yoon, C. (in press). Multi-tier design experiments in mathematics, science, and technology education. In A. E. Kelly, R. A. Lesh, & J. Y. Baek (Eds.), Handbook of design research methods in education. Mahwah, NJ: Lawrence Erlbaum Associates.