In Canada, evidence showed that Francophone communities living in linguistic minority situations have difficulty accessing health and social services in their preferred language, which can negatively affect the quality and safety of these services. The active offer is a practice designed to counter the effects of linguistic minority status by proactively inviting clients to express themselves in the official language of their choice at the first contact. There is currently no validated tool for assessing this competency among future health and social service professionals. This article presents the creation and validation steps of the Grille d’observation des indicateurs de compétence en offre active de services en français, a tool intended to support education programs in teaching and evaluating this competency using simulations.