This book aims to reflect the contours of the notion of aid as it is questioned by current scientific research. This notion appears as fuzzy in its scope of intervention, in its methods of multidisciplinary and multi-referential approaches in theoretical frameworks convened. Present in different areas that we propose to investigate in the book (training and teaching at university, inclusion in education, but also prevention, the fight against failure in orientation), the notion of help questions research in SHS and Computer Science. It comes in different formats labeled "help" but also "support", "support" or "guidance". In order to take stock of these notions and to question their differences, we convoke several authors (French and foreign) who participate by their research (-action) underlining components and environmental factors of the device that give this notion any its thickness.