In recent years there has been an increased interest on the role of web-based simulations in student learning. I have conducted a preliminary study on the effectiveness of interactivity in 3-Dimensional simulations to help students learn the interference phenomenon. The study was based on a Pretest-Posttest design with the experimental and control groups completing different but equivalent web-based tutorials. The experimental tutorial was based on the use of highly interactive 3-dimentional simulations developed by the WebTOP project. The only difference between the control tutorial and the experimental tutorial is that the control tutorial used static images instead of simulations. The content of both tutorials addressed the common misconceptions students usually have about waves and interference as identified in previous physics education research. The results suggest that student learning from both tutorials was significant with no significant difference in learning between the two groups. The study also identified several factors that might have affected the results and that should be the subject of further study.

This report describes the design, development, implementation, and evaluation of a web-based tutorial designed to teach graduate students about the statistical concept of power. It contains a literature review of techniques used to teach statistics, similar computer-based programs for representing the concept of power, and instructional theories that pertain to web-based tutorials. It describes the process of designing and developing this tutorial in detail. The results section contains a description of the product implementation with three different groups and discusses the qualitative and quantitative findings from each of these implementations. Finally, there is a discussion of the tutorial's strengths and weaknesses.