The purpose of this article is to describe second-year elementary school teachers’ implementation of invented spelling in the classroom. The Essential Supports for Emergent Writers model was adapted to analyze the invented spelling of five teachers who were observed twice during the school year. The results show that in the context of invented spelling, students are able to verbalize their knowledge of the language and that teachers provide spelling explanations based on their conceptions. Invented spellings therefore seem to offer adequate conditions of effectiveness for developing writing skills in the context of teaching at the primary level.