First Published in 1999. Routledge is an imprint of Taylor & Francis, an informa company.

Volume 27, Number 2, 1999. Contents: T. Koschmann, Editor's Introduction:The Edge of Many Circles: Making Meaning of Meaning Making. Analyses: P.J. Glenn, T. Koschmann, M. Conlee, Theory Presentation and Assessment in a Problem-Based Learning Group. C.H. Frederiksen, Learning to Reason Through Discourse in a Problem-Based Learning Group. A.S. Palincsar, Applying a Sociocultural Lens to the Work of a Transition Community. J.L. Lemke, Typological and Topological Meaning in Diagnostic Discourse. R. Hall, The Organization and Development of Discursive Practices for "Having a Theory." Commentaries: J.L. Green, M. McClelland, What Difference Does the Difference Make? Understanding Difference Across Perspectives. J. Roschelle, Transitioning to Professional Practice: A Deweyan View of Five Analyses of Problem-Based Learning.