This six-year study involved an evaluation of whether student-learning gains for an online homework system that emphasized areas in which students are known to have difficulties--molecular-level conceptualization and visualization, and being able to recognize and relate a concept when it is represented symbolically, numerically, or visually--could…

The author and colleagues have designed an Exploration Center to supplement lecture-oriented teaching in large introductory physics courses. At the center, students perform hands-on homework problems derived from lecture demonstrations. The style of exploration problems is conceptual and open ended. Methods are discussed for integrating…