The level of inclusion of all its members in the complex of community activities is a fundamental indicator of the progress of a society that wants to be defined as civil and there is a rising awareness about the evidence that diversity and inclusion are linked to positive outcomes. The Universal Design approach is increasingly recognized as the one that helps to shape environments – in terms of physical and virtual environments, as well as buildings, goods and services – so that it can be accessed, understood, and used to the greatest extent possible by all people, regardless of their diversity. Thus, making a more inclusive society for all. This short essay summarizes some reflections resulting from studies, research and field practices reported by literature, and also experienced by the author in her training as a researcher and university professor. Attention is focused in particular on some critical issues and implications inherent in the practical application of UD principles, as well as on the importance of its multidisciplinary dimension, which also entails a different attitude towards the training of professionals.