The STEP environment for distributed problem-based learning on the World Wide Web. - Constance Steinkuehler; Sharon J. Derry; David K. Woods; Cindy E. Hmelo-Silver (CSCL, 2002)

From parallel play to meshed interaction: the evolution of the eSTEP system. - Cindy E. Hmelo-Silver; Sharon J. Derry; David K. Woods; Matt DelMarcelle; Ellina Chernobilsky (CSCL, 2005)