The spread of a sort of «Second Degree Literature» in the twentieth and twenty-first centuries constitutes as an unequivocal proof of the importance that acquired distinct literary system factors other than the product have. Of these factors the most unique are the market,the consumer, and the interference with other systems. For example, Cid material, in general terms, and Cantar de Mio Cid, in particular, applies the analysis tools of paratextuality and intertextualityproposed by Genette. The literary system factors are supplemented by a communicative and pragmatic narratological approach. They are also supplemented with a textual tradition in which some versions from different artistic and literary genres have achieved products, that to a greater or lesser extent, have got a social, cultural and educational role.