to the traditional class than to the ALC-based classes. We believe this finding reflects the classroom-relativity of the questions composing this construct. Simply lecturing clearly in an auditorium-style classroom might count in students' minds as a very effective use of that room, while the evidently greater potential of the ALCs e with their unusual physical layout and technological affordances e raises the standards by which effective use is evaluated. Indeed, effective use of the classroom might be masked if students fail to recognize the transformed role of the instructor from one who lectures to one who delivers problem solving sessions that compel students to actively grapple with key disciplinary constructs.