Johnson, H. L., Gardner, A., Smith, A., Olson, G., & Wang, X. (2019). Interacting with dynamic computer activities impacts college algebra students’ math attitudes and performance. In Otten, S., Candela, A., de Araujo, Z., Haines, C., & Munter, C. (Eds.). Proceedings of the 41st Annual Meeting of the North American Chapter of the International Group for the Psychology of Mathematics Education (pp. 1424-1433). St Louis, MO: University of Missouri. DOWNLOAD.
Johnson, H. L., Kalir, R., Olson, G., Gardner, A., Smith, A., & Wang, X. (2018). Networking theories to design a fully online assessment of students’ covariational reasoning. In Hodges, T.E., Roy, G. J., & Tyminski, A. M. (Eds.). Proceedings of the 40th annual meeting of the North American Chapter of the International Group for the Psychology of Mathematics Education (pp. 1343-1346). Greenville, SC: University of South Carolina & Clemson University. DOWNLOAD
Johnson, H. L., McClintock, E., Kalir, R., & Olson, G. (2018) Networking theories to design dynamic covariation techtivities for college algebra students. In (Eds.) A. Weinberg, C. Rasmussen, J. Rabin, M. Wawro, and S. Brown, Proceedings of the 21st Annual Conference on Research in Undergraduate Mathematics Education (pp. 1224-1233), San Diego, CA: RUME. DOWNLOAD
Johnson, H. L., McClintock, E., Hornbein, P., Gardner, A., & Grieser, D. (2017). When a critical aspect is a conception: Using multiple theories to design dynamic computer environments and tasks to foster students’ discernment of covariation. 10th Congress of European Research in Mathematics Education, Dublin, Ireland. DOWNLOAD
Tzur, R., Johnson, H. L., Norton, A., Davis, A., Wang, X., Ferrara, M., Jorgensen, C. & Wei, B. (2017). Conception of number as a composite unit predicts students’ multiplicative reasoning: Quantitative corroboration of Steffe’s model. In B. Kaur, W. K. Ho, T. L. Toh, & B. H. Choy (Eds.), Proceedings of the 41st Conference of the International Group for the Psychology of Mathematics Education (Vol. 4, pp. 289-296). Singapore: PME. DOWNLOAD
Johnson, H. L. (2016, July). Designing technology-rich tasks to foster secondary students’ covariational reasoning. 13th International Congress on Mathematical Education, Hamburg, Germany. DOWNLOAD
Johnson, H. L. (2015, July). Task design: Fostering secondary students’ shifts from variational to covariational reasoning. In Beswick, K., Muir, T., & Wells, J. (Eds.) Proceedings of the 39th Conference of the International Group for the Psychology of Mathematics Education (Vol. 3, pp. 129-136). Hobart, Tasmania: University of Tasmania. DOWNLOAD