Figure 4. Contents View A Contents View of a simple course. The open topic is currently Classical Music which has four neighbouring topics and four sub-topics. The Path button is a pop-up menu which in this case indicates that Classical Music is a sub-topic of Types of Music, which in turn is a sub-topic of the top level, i.e., Music Course. A user can navigate through the topics hierarchy by selecting a neighbouring-topic, a sub-topic, or a parent-topic from the path.

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