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Authoring tools and methods Distance education and telelearning Interactive learning environments some challenges and difficulties which go beyond the facilities offered by content genera-quately conceived could allow for different instructional designs with their own objectives through the definition of different aggregations and sequences of the same learning objects. These ideas led to different proposals for the creation of reusable learning objects, among which SCORM (Shareable Content Object Reference Model) seems to be the most promising one, counting with ample support in government, educational and corporative organizations (Carnegie Mellon, 2004). 0360-1315/ $- see front matter 2008 Elsevier Ltd. All rights reserved