An architecture to combine meta-cognitive and cognitive tutoring: Pilot testing the Help Tutor. - Vincent Aleven; Ido Roll; Bruce M. McLaren; Eunjeong Ryu; Kenneth R. Koedinger (AIED, 2005)

The Help Tutor: Does Metacognitive Feedback Improve Students' Help-Seeking Actions, Skills and Learning? - Ido Roll; Vincent Aleven; Bruce M. McLaren; Eunjeong Ryu; Ryan Shaun Joazeiro de Baker; Kenneth R. Koedinger (Intelligent Tutoring Systems, 2006)

Towards Teaching Metacognition: Supporting Spontaneous Self-Assessment. - Ido Roll; Eunjeong Ryu; Jonathan Sewall; Brett Leber; Bruce M. McLaren; Vincent Aleven; Kenneth R. Koedinger (Intelligent Tutoring Systems, 2006)