T3 was founded at The Ohio State University by Professors
Frank Demana and Bert Waits.
In the summer of 1988 they offered three one-week courses for teachers to learn how to use the
power of computer and graphing calculator visualizations to enhance the teaching and learning of
pre-calculus mathematics (pre-calculus is the course in US high schools typically preceding a calculus
course). Beginning in the summer of 1995, Demana and Waits invited interested educators to participate
in their annual T3 summer institute week at Ohio State. That experience and participation
in other T3 conferences created the need to expand the T3 program to countries
outside the US.