A Formative Evaluation of the PACT Algebra II Tutor: Support for Simple Hierarchical Reasoning. - Albert T. Corbett; Holly J. Trask; K. Christine Scarpinatto; William S. Hadley (Intelligent Tutoring Systems, 1998)

Analyzing and Generating Mathematical Models: An Algebra II Cognitive Tutor Design Study. - Albert T. Corbett; Megan McLaughlin; K. Christine Scarpinatto; William S. Hadley (Intelligent Tutoring Systems, 2000)

Modeling Student Knowledge: Cognitive Tutors in High School and College. - Albert T. Corbett; Megan McLaughlin; K. Christine Scarpinatto (User Model. User Adapt. Interact., 2000)