As intelligent tutoring system (ITS) issues are investigated and intelligent tutoring systems are developed, evaluation methodology becomes important. Basic researchers, system developers, and educators working with ITS all have motives for becoming involved in ITS evaluation. In formative evaluation, researchers examine a system under development, to identify problems and guide modifications. By contrast, summative evaluation is carried out to support formal claims about the construction, behaviour of, or outcomes associated with a completed system. Different methodologies are suitable for different types of evaluation, some focusing on internal considerations, such as architecture and behaviour, others on external considerations, such as educational impact. This paper draws upon the areas of intelligent tutoring systems research, expert systems design, computer-based instruction, education, and psychology to identify techniques for the formative and summative evaluation of ITS. Evalu...

The Web Interface for Statistics Education (...) is a website built around interactive tutorials designed to teach introductory and advanced statistical concepts. The tutorials use Java applets that dynamically illustrate the statistical concepts being taught. By using Java applets, we teach statistics in a manner not possible in a traditional classroom environment. In this paper, we provide examples of the applets, illustrate how students use them, and we report the outcome of a study that examined tutorial effectiveness as a learning tool.