In Pilot 2, data have been collected mainly for the following purposes: [1] achieving the pilots' research objectives, as outlined in the previous section, and [2] managing and monitoring the pilots' implementation and [3] informing technical developments in the ARETE CLB app. In Pilot 2, anonymized student data have been collected in correspondence with the research objective of testing the efficiency of Augmented Reality for STEM education, to evaluate if the CLB apps can help students improve test scores by up to 33 % and increase the retention rate by up to 100 %. Additionally, pedagogical aspects of the AR use and its impact on teaching and learning will be evaluated. To respond to these claims, the methodology applied included pre-tests and post-tests for students and additional qualitative surveys for teachers. Pilot 2 collected only personal information (name, surname, contact information) from the participating teachers, in the form of consent forms (necessary to obtain the participants’ consent to participate in the ARETE research activities). These consent forms have been collected by European Schoolnet (EUN) and stored on EUN’s secure servers. All personal data collected within the project activities will be anonymised upon completion of the project, apart from data that need to be kept for the full audit period. As in the case of Pilot 1, and in accordance with the data minimization principle, no personal information from the participating students or their parents/legal guardians will be transferred to EUN or to other members of the ARETE consortium for the purpose of Pilot 2. The only personal information collected from students and their parents/legal guardians will be for the purpose of acquiring consent/assent, and these forms have been collected at the level of each participating school. EUN has established a Memorandum of Understanding with each participating school in Pilots 2 in order to ensure that: the heads of the participating schools are appropriately informed about the research carried out in the context of the ARETE project and have provided their agreement for the school to participate in research and that the schools have all the necessary permissions from the parents/legal guardians of the pupils participating in the ARETE research or, in the case such permissions do not exist at the school level, ensure that the schools collect all necessary consent forms from the participating students. This measure is meant to reduce the transfer of sensitive personal information between organisations unless absolutely necessary.