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' contributions (N = 22) suggested they were well received. A subsequent survey of students' recollections of the assignments (N = 12) suggested increased student concern about the validity of Wikipedia, and that students viewed the assignment generally positively. The instructor discusses his recollections of problems and opportunities and proposes a workflow for future Wikipedia assignments. (Contain 2 tables and 4 footnotes.)