This case study of a collaborative design process of two pupils at a special school for intellectual development uses the documentary research method according to Barbara Asbrand and Matthias Martens to show how cognition and reflexivity emerge in the design process. The dynamic functional system examined here, which comprises the two pupils, their artefact and the tools and materials involved, achieves a high degree of elaboration and the learning goal of emergent knowledge acquisition in the experimental design process and its targeted planning. However, educational processes that are conceived from complex human-thing constellations are difficult to take into account and recognise in the current education system. Inclusion must therefore be accompanied by a systemic change in educational institutions that transforms schools, homes and neighbourhoods into a cohesive social and ‘transformative educational space’ (Hansen 2022).