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The iSchool at Drexel, College of Information Science and Technology, will host the lecture "Analysis of Transactivity in Group Discussions in On-Line and Face-to-Face Settings" by Dr. Carolyn Penstein Rose, Carnegie Mellon University, on Friday, January 22, 2010, at 12:30 p.m. in room 014, Rush Building (30 N. 33rd Street), Drexel University, Philadelphia, PA. This talk describes a five-year effort to formalize and computationally model a construct that has been called "transactivity" in discourse, beginning with analysis of synchronous and asynchronous on-line discussions and then extended to the case of discussion in classrooms. This lecture is part of The iSchool at Drexel Colloquium Series. The video of the December 2, 2009 lecture "The Google Books Settlement: Books, Computers, and the Law" by James Grimmelmann is available at http://www.ischool.drexel.edu/video#78 For more information, visit http://www.ischool.drexel.edu or contact Robert Allen, PhD, at [log in to unmask]