http://www.ihi.org/education/IHIOpenSchool/resources/Pages/AudioandVideo/QI-Games-The-Red-Bead-Experiment.aspx
Please see the YouTube link to Dr Don Berwick's demonstration of Deming's Red Bead Experiment. Really good way to show how poor processes can impact staff and lead to a blame culture. Apparently when he was a medical student, Don Berwick worked in the Blood bank and cross-matched units! -don't know if they had competencies in those days!
enjoy
bw