Based on the software program by the Contemporary Physics Education Project (CPEP) developed by Andria Erzberger and her students, with physics assistance from Michael Barnett (LBNL) and Helen Quinn (SLAC), and technical assistance from James Quinn.
Some material was taken from the CPEP Classroom Activity Packet and from a soon-to-be-completed book by R.M. Barnett, H. Muehry, H.R. Quinn, G.J. Aubrecht, R.N. Cahn, J. Dorfan, M. Dresden, G. Goldhaber, J.D. Jackson, and K. Olive.