This book is a methodological guide intended for those who wish to better understand how to conduct research in the education and training sciences. It is organized into three main parts. The first part deals with postures, emphasizing the idea that engaging in a research process involves taking a different stance from that of a social or professional actor. For example, this may require converting a professional or social question into a research question or reflecting on the use of a social vocabulary in research. The second part concerns practices, that is, how research is conducted: the definition of a research question based on findings, theoretical exploration and problematization, the production of empirical information and its analysis and restitution. The third and final part concludes by focusing on the diversity of research forms; not only research cultures specific to disciplinary fields and approaches, such as action research, collaborative research or research training, but also the design choices in terms of multi-, inter- or trans-disciplinarily.