In the context of its European collaborations, RCeL (www.rcel.enl.uoa.gr) has successfully completed two series of professional development seminars with groups of educators from two different Official Language Academies of Spain: one in Santiago del Campostela, Galicia (2018) and the other in Elde, Alicante (2016). Funded by ERASMUS+ KA1, both seminars focused on inter- and cross-language mediation – an interdisciplinary area that our Centre specializes and publishes in. Two more Spanish language academies have requested partnership with NKUA – the ΕΟΙ de Coruña (2019) και ΕΟΙ de Tenerife (2020).