Classtalk: A Classroom Communication System for Active Learning
R.J. Dufresne, W.J. Gerace, W.J. Leonard, J.P. Mestre, L. Wenk 1996 Journal of Computing in Higher Education v7 p3-47
This article describes the use of a classroom communication system in large introductory physics classes to facilitate presentation of questions for small group work, collection of student answers, and display of histograms of student results, all of which helped discussion of students' reasoning of physics questions.