This document is the fourth part of a five-part work on human-centred research and design for inclusive mobility intended for future research candidates at Université Polytechnique Hauts-de-France (UPHF) and INSA Hauts-de-France, as well as the PhD students of the Laboratory of Industrial and Human Automation control Mechanical Engineering and Computer Science (UPHF, CNRS, UMR 8201-LAMIH). The aim of the whole work is to help students understand the principles of human-centred design of technologies and services. Indeed, according to the European Union (EU), the European industry will better serve society by complementing the techno-economic vision of Industry 4.0 (digitalization, AI technologies, efficiency and flexibility of production) with the perspective of Industry 5.0, which focuses on human centricity, sustainability and resilience (Renda et al., 2022). The first two parts present UPHF and LAMIH—in particular, the research strategies and the platforms and projects related to mobility and the maintaining of mobility − as well as two human-centred theoretical approaches to technology design. The third part presents the qualitative and quantitative research approaches. The next part (the present document) addresses the issue of ethical research. The fifth and final part will conclude with the writing of scientific papers.