“…Given the different compositions and roles of the expert groups present at EU level, this section will aim at unpacking "the […] nexus that has been established between the European executive and external actors that are counted as experts" (ibid.). Those expert networks are present at different institutional levels within the European Union´s administrative apparatus: the Commission´s own expert groups (Rhinard, 2002;Metz, 2013Metz, , 2015Chalmers, 2014;Rimkutė and Haverland, 2015), the Comitology committees (Steunenberg, Koboldt and Schmidtchen, 2000;Egeberg et al, 2003;Trondal, 2002;Brandsma and Blom-Hansen, 2012;Brandsma, 2015;Siderius and Brandsma, 2016); the Council working groups (Beyers and Dierickx;Niemann, 2004;Lewis, 2005;Aus, 2008;Wessels et al, 2015;Kaniok, 2016) and finally the transgovernmental administrative networks (or European administrative networks, EANs). Since Twinning share many characteristics with EANs, with regular and intensive exchange between civil servants of the EU Member States and the receiving countries, I will come back to those in a later section of this chapter.…”