One of the slides that I frequently used during my presentations as staff member of the Wikimedia Foundation. Data source: Frank Schulenburg, Klaus Wannemacher: Wikipedia in Academic Studies – Corrupting or "Dramatically Improving" the Quality of Teaching and Learning?, in: Peter Ebner / Mandy Schiefner (eds.), Looking Toward the Future of Technology Enhanced Education: Ubiquitous Learning and the Digital Native, Hershey, PA, 2009, ISBN 978-1-61520-678-0, p. 295–310.