The interactive learning environment (ILE) is designed to combine the traditional resources of a textbook with the "hands-on" design experiences that are vital to a real understanding of basic engineering principles. The ILE builds on the technology developed for the World Wide Web to provide a learning environment that can be easily accessed from any browser. In addition to browseable text, Java-based computer-aided design (CAD) tools can be accessed through interactive figures embedded in the text, where students can investigate circuit behavior under the guidance of focused tutorials.
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Allen et al. (2000) studied this question.