With the aim of determining the development of the knowledge, skills, attitudes and values of the preservice teachers involved in the project, a reflective assessment tool will be developed. The assessment tool to be developed will consist not only of a knowledge and skills (critical thinking, systematic thinking and STEAM etc) test, but also of scales that reveal the development of attitudes and values. Moreover, open-ended questions, by which the preservice teachers will be able to candidly write their opinions, will be included.