Tabla de Contenidos: “…Learning objects: resources for learning worldwide / Stephen Downes -- A first step towards a theory of learning objects / Mike Sosteric and Susan Hesemeier -- Modelling units of learning from a pedagogical perspective / Rob Koper and René van Es -- Three objections to learning objects / Norm Friesen -- Learning objects revisited / Erik Duval and Wayne Hodgins -- Part 2: Constructing and creating learning objects. …”