Held every August since 1992, the Skeptic's Toolbox was formed by psychologist and now-retired University of Oregon professor Ray Hyman. The workshop, held over four days, focuses on making people into better critical thinkers by investigating a central theme. The attendees are broken up into groups and given tasks that they must work on together and present in front of the entire group on the last day. The Skeptic's Toolbox is sponsored by the Committee for Skeptical Inquiry. Started in 1989, the workshop is held in Eugene, Oregon.