The ATTACHED project aims to articulate human resource management (HRM) and innovation in small and medium-sized enterprises (SMEs) via the leader's attachment style. Adopting a resolutely new approach, it proposes to identify the relational mechanisms at the heart of this relationship by going beyond the practice-centred perspective commonly employed in the literature. Derived from psychology, attachment theory will provide a new perspective on the role played by emotional patterns and relational behaviours adopted by individuals in creating virtuous or vicious circles between HRM and innovation. Making use of an ethnographic, longitudinal study carried out in 4 innovative SMEs, coupled with an experiment, a dynamic processual model with a multi-level perspective will be developed, to be discussed each year during workshops bringing together researchers and socioeconomic partners. The results obtained will also be the subject of 6 papers which will be presented at reference conferences (AGRH, EGOS...) before being published in high-ranking journals (Human Resource Management Review, The Leadership Quaterly...). A collective work in English will be published with a view to creating an interdisciplinary community of researchers around the theme of HRM and innovation in SMEs. In addition, special attention will be paid to open science through publication of articles in Forbes, Harvard Business Review and The Conversation and production of popularisation videos in FNEGE MEDIAS. Pedagogical cases will also be developed for students. Finally, the research project will act as a real springboard towards submission of an ERC project whose objective will be to create the first European observatory dedicated to the study of HRM and innovation in SMEs.