Resumen: The design and implementation of a training experience with future Peruvian mathematics teachers is described, aimed at developing the competence of analyzing the didactic suitability of curricular materials on probability. From a qualitative approach and with the support of the guidelines of didactic engineering based on the Ontosemiotic Approach, the protocols of written responses of 38 participants are available. The results show limitations in the assessment of suitability indicators and difficulties to elaborate a reasoned judgment on it. It is concluded that there is a need to promote reflective practice on the use of curricular materials and proposals for improvement changes in all facets of didactic suitability in a joint manner. Idioma: Inglés DOI: 10.1590/1980531410031_en Año: 2023 Publicado en: Cadernos de Pesquisa (Fundação Carlos Chagas) 53 (2023), e10031 [21 pp] ISSN: 0100-1574 Factor impacto CITESCORE: 0.8 - Cultural Studies (Q2) - Gender Studies (Q3) - Education (Q4)