Resumen: In this work, we show the results of a research with pre-service mathematics secondary teachers about their Van Hiele level regarding the proof in Geometry. We observe three different profiles whose characteristics are described. These descriptions allow us to foresee certain differences when carrying out proof teaching in secondary school. The presence of a profile with a lower level than that assumed for some high school students stands out. The other two profiles show differences regarding the presence of some advanced proof strategies. Idioma: Inglés Año: 2021 Publicado en: Mathematics Teaching-Research Journal 13, 3 (2021), 99-130 ISSN: 2573-4377 Originalmente disponible en: Texto completo de la revista