The notion of mediation has been the object of growing interest in second language education in recent years. The increasing awareness of the complex nature of the process of learning--and teaching--stretches our collective reflection towards less explored areas. In mediation, the immediate focus is on the role of language in processes like creating the space and conditions for communication and/or learning, constructing and co-constructing new meaning, and/or passing on information, whilst simplifying, elaborating, illustrating or otherwise adapting input in order to facilitate the process concerned. At a deeper level though, the notion of mediation embraces a broader spectrum of dimensions and connotations. Mediation has been defined as a "nomadic notion" (Lenoir 1996) insomuch as it is at the core of a variety of scientific disciplines and the term "mediation" is used in different senses in different contexts.