In this talk, I will first present the main results of a syntactic study on self-repair and self-refomulation on adult spoken French and Spanish. These two phenomena, which have different epistemic trajectories, have converged in few works: while reformulation is mainly treated in continental European linguistic studies, repair has been developed in Anglo-Saxon conversationalist approaches. Adopting a syntactic perspective, our work offers a typology that allows us to compare the frequency of both phenomena in a corpus entirely segmented into syntactic units. We have also been able to confirm and complement the description of existing tendencies described in other languages for the realization of self-repair. In the second part, we will try to show how these new observations on discursive production in interaction can help language acquisition studies.