I'm not so happy with the definition of the usability of a learning object adopted by this paper - "Usability in e-Learning is defined by the ability of a learning object to support or enable […] a very particular concrete cognitive goal.†So I'm uncomfortable with some of the details of the definition of reusability offered: "the aggregation of the adequacy of the learning object to each of its possible contexts of use, multiplied by the number of those contexts." Still, I think that the overall approach has merit, and some suggestions - "Perhaps more sophisticated encapsulation techniques may provide more information regarding contexts of use." - are very much in line with my own thinking. More soon.
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