Johnson, H. L. (2017, December). Promote students’ smooth covariational reasoning. Mathematics Education Colloquium. Tempe, AZ: Arizona State University.

Johnson, H. L. (2017, November). Networking theories to design techtivities to promote students’ covariational reasoning. Universiteit Utrecht Freudenthal Institute Research Meeting, Utrecht, Netherlands.

Johnson, H. L. (2017, October). Task design to promote students’ covariational reasoning: A multi-theoretic approach. Universität Bremen Mathematisches Kolloquium. Bremen, Germany.

Johnson, H. L. (2017, September). Networking theories to design dynamic computer environments to foster students’ quantitative and covariational reasoning. Mathematics Education Research Colloquium, Linköping, Sweden: Linköping University.