In this paper, a distributed distance education system is built on WWW (World-Wide Web), called CBTVC (Competency-Based Training Virtual Classroom). This system extends CBT self-learning materials for vocational training into asynchronous distance education net and offers a “Registration → Self-learning → Qualification” learning cycle. This research investigates the characteristics of distance education and the media in learning materials. Built on FreeBSD, CBTVC environment provides not only network learning materials but also different self-assessment methods. CBTVC and its network learning materials can be represented as a hypermedia organization chart, which is a learning model for analyzing the learning portfolio from web log files. An experimental learning unit “waveform measurement by oscilloscope” is used to demonstrate these results.
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