Regional sustainability assessment has become increasingly important for both scientists and policy-making decisions, as evidenced by the rising amount of academic literature dedicated to this topic. Composite indicators (CI) have remained an assessment tool that is highly appreciated by decision-makers for its ability to summarize a set of indicators into a single index. However, the lack of a unanimously accepted theoretical framework makes the process of composite indicator construction dependent on multiple contextual variables such as the geographical context (national or sub-national),...