International audienceThis work draws on a research analyzing dyspraxic students' difficulties in geometry and suggesting a dyadic design for enabling learning (Petitfour, 2015). We are here rather dealing with that dyadic design in an ordinary context. Resting on a framework elaborated to analyse action with geometrical instruments, the purpose of the paper is to study the potential of dyadic designs for figure reproduction tasks (Perrin-Glorian & Godin, 2014, to appear), a student giving instructions and another drawing, for geometrical learning. In the first part of the text, we introduce our analysis framework elaborated from several resources: the instrumental approach (Rabardel, 1995), gesture development in neuropsychology (Mazeau & ...