The purpose of this paper was to design and to validate a questionnaire of perception of elementary education teachers from third to sixth grade about student learning based on key competences. Eight dimensions were established corresponding to the eight
key competences in the initial creation of the instrument (Royal Decree
1513/2006). In the content validity, experts (n = 35) appreciated the construct, the dimensions and the
questionnaire items. The results of the statistical analysis of the items
showed adequate comprehension validity of participants (n = 45 teachers). In the construct validity (n = 255 teachers), the results showed correct psychometric quality, internal
consistency, reliability and the adequacy of the structural model. The
reliability coefficients showed a valid and reliable version of questionnaire
consisting of 24 items. The instrument had evidence of external validity, since
the results were congruence with research main findings. It is important to
note the high perception of the elementary teachers from third to sixth grade in terms of key competences.