The author examined Wikipedia's use as an instructional tool in two studies. The widespread use of Wikipedia indicates that students need to learn more about its workings and validity. Wikipedia articles relevant to psychology were edited by students in one class and critiqued in another class. Analysis of the subsequent editing of students'…

This article explores different forms of openness and closure in two knowledge communities: the fictional world of Castalia in Hermann Hesse's great work "The Glass Bead Game", and the twenty-first-century cyberspatial universe of Wikipedia. These two worlds differ in some important respects, but they also share a number of educationally…