The aim of this study is to get conclusions about the possible effects the implementation of CLIL programs (Content and Language Integrated Learning) based on a foreign language (L3) in the Primary Education in the Galician region can bring to the academic performance of the students as for the co-official languages in that region, that is, Galician and Spanish (L1 and L2).
Academic grades of students from 13 schools were analyzed, for two consecutive school years. The CLIL group consisted on 13 classrooms, whereas the non-CLIL was composed by 44. Representatives of all the levels in Primary education were present.
From a conservative approach, results tell us that the difference between the participants groups can not be explained as significant. Being less conservative we could say that a small difference can be observed for some of the groups, but not in favour of the non-CLIL groups.
(English version translated from the original in Galician)