Online Articles for Further Reading on Problem Based Learning

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