Kotelawala, U. (In press) Collaboration Among Teachers: Planning to Derive the Quadratic Formula, Mathematics Teacher, Reston, VA.
Math, Science, and Technology: Summer Institute for Teachers (2008) Consultant and Professional Developer.
Kotelawala, U. (April, 2008) Factors affecting proving in the classroom. National Conference of the National Council of Teachers of Mathematics in Salt Lake City.
Kotelawala, U. (March, 2008) Confidence and Logic in Mathematics Education around the World: Building Strength in Our Elementary School Mathematics Teachers. Thirteen/WNET’s third annual Celebration of Teaching and Learning in New York City.
Kotelawala, U. (August, 2007) Factors Affecting the Role of Proving in Secondary Mathematics Classrooms. Mathematical Association of America’s Mathfest in San Jose.