The Erickson Research Centre is developing e-Value: a multimedia system for the assessment of learning skills, the detection of learning difficulties, the design of educational interventions and the delivering of digital didactic content. The system focuses on the application and use of multimedia materials for evaluation, teaching, recovering and empowering. Material traditionally published in books or CD’s is implemented like a learning object and archived in repositories in order to facilitate its search, recombination and use. 

For developing the system are needed:

1.     A description of the didactic materials by content, cognitive context, application. The materials (learning objects and ebooks) have to be recognized  and retrieved by an automatic system, and be browsable or searchable through a search engine.

2.     A thesaurus on the cognitive processes regarding mathematics, reading-writing, languages and metaphonology, and an ontology connecting the whole set of description tags in a structure

3.     A DSS (Decision Support System), able to support the educators, offering different didactical material depending of the various situations.

This paper describes the 1^st and 2^nd phases, and the first theoretical reflections on the 3^rd.

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