The Centre de Recherche sur les Expertises, les Arts et les Transitions (CREAT) is a multidisciplinary laboratory developing researchs in the Arts and Social Sciences on expertise and transitions. In this works, expertise is understood as the framing of a problematic situation, by policies, professional intervention or usual devices (Internet). Defined as passages between different states, transitions (artistic, democratic, demographic, ecological, digital or societal) are questionned as places of expertise and performance.