The Toolkit Team is a collaboration of university groups at Michigan State and Berkeley, the Shell Centre at Nottingham and Durham Universities in the UK, and Inverness Research Associates. It works with people across the United States who are active in improving the teaching and learning of mathematics in their school system.

Many of these collaborations have been built over a period of years in the same team's work as the Mathematics Assessment Resource Service - MARS.

The project is funded by the National Science Foundation.

Toolkit elements are designed and developed by:

Alan Bell, Mary Bouck, Hugh Burkhardt, Rita Crust, Phil Daro, Elizabeth Jones, Daniel Pead, Marcia Ratliff, Mary Regan, Alan Schoenfeld, Mark St John, Malcolm Swan, Pam Tambe, and Sandra Wilcox.