Transforming Undergraduate Programs in Science, Technology, Engineering, Mathematics: Looking Back and Looking Ahead By Jeanne Narum Scaling Up Research-Based Education for Undergraduates: Problem-Based Learning By D. E. Allen,B. J. Duch, S. E. Groh, G. B. Watson, H. B. White, III
What is Problem Based Learning? By Barbara J. Duch
At M.I.T., Large Lectures Are Going the Way of the Blackboard By Sara Rimer
Interdisciplinary Problem-Based Learning: An Alternative to Traditional Majors and Minors By Robert J. Sternberg
University of Delaware site with multiple articles about Problem Based Learning