Using Item Response Theory (IRT) to select hints in an ITS.

Michael J. Timms Using Item Response Theory (IRT) to select hints in an ITS. 213-221 2007 AIED conf/aied/2007 db/conf/aied/aied2007.html#Timms07 http://www.booksonline.iospress.nl/Content/View.aspx?piid=6781