The turn of agrarian sciences and agricultural extension from reductionist and transfer of technology, respectively, towards systemic approaches has transformed agricultural/rural development thinking in the last decades. Nevertheless, the emergence of Agricultural Innovation Systems (AIS) has to confront a number of gaps among which the expert – lay knowledge gap is of major importance. This paper aims at exploring such a gap as well as obstacles to participatory development from a critical realist point of view.

The purpose of this piece of work is to investigate, through a literature review, the role of intermediaries in agricultural extension and rural development. In the first place, a general view of the roles of intermediaries, as depicted in literature, is presented. Then, one of the main types of intermediaries, facilitators is outlined based on a comprehensive review of the literature, particularly in the healthcare sector.