Interesting and novel presentation of the functionality of a personal learning environment developing (as we have in Plearn) the concept of knowledge modeling as a stage between aggregation and syndication. Modeling, in turn, gives us access to various processes, such as expertise analytics, process modeling, and document similarity. These, in turn, facilitate output processes, such as quality-based resource recommendation, expert ranking, or context-aware notification. But what seems to me characteristic of this system is that it is entirely automatic - it is not a place where people meet and work, it is a machine that finds, measures and analyzes. Nothing wrong with that, but you need the interaction and creativity to form a complete PLE.
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