1. Limitations of student control: Do students know when they need help?;Aleven,2000
2. Toward tutoring help seeking: Applying cognitive modeling to meta-cognitive skills;Aleven,2004
3. Help seeking and help design in interactive learning environments;Aleven;Review of Educational Research,2003
4. The analogical origins of errors in problem solving;Anderson,1989
5. Cognitive tutors: Lessons learned;Anderson;Journal of the Learning Sciences,1995