Question Development: Teaching students to ask their own questions.
Discussing History: The tab on the upper left corner of this site.
Phillips Exeter Academy Website: How You'll Learn (the Academy's explanation of Harkness. Includes a video, and this: "It’s not about being right or wrong. It’s a collaborative approach to problem solving and learning"). See also on the school's website, Harkness Teaching Tools, and essays on Harkness.
3-4 minute videos:
The Harkness Difference: A general overview.
Harkness in Chicago: On Exeter's partnership with the Noble Academy Charter School in Chicago.
Reflections on a Harkness Class: History. A conversation with a teacher after his Harkness History class.