Lots of efforts (ARIADNE, Dublin Core, IMS, eBioMED.ch, IEEE-LTSC, CEN-CENELEC, Medline Mesh tree, SCORM, etc.) have been invested in defining a proper indexation schema, resulting in an appropriate descriptor or header for describing pedagogical documents. The difficulty stems from the following paradox: the header should be as detailed as possible to get, when querying the knowledge pool, an adequate set of documents, and as light as possible to make sure that indexation will be performed. So whatever the international standard might be, it will achieve its aim of fostering share-and-reuse only if the majority of the involved persons accept to use it! The question therefore is: “How do you convince an author to index a document?” To try and answer this question, we are investigating the key factors of motivation for an author.
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