“…High school student answers revealed different characteristics of the understanding of the concept of derivative, in relation to mathematical elements and modes of representation, in accordance with the progression in understanding (Figure 8). We have considered different mathematical domains and teaching levels: preservice preschool teachers, length and length measurement (Sánchez-Matamoros, Moreno, Callejo, Pérez-Tyteca & Valls, 2017); pre-service primary teachers and fractions (Ivars, Fernández & Llinares, 2017), pre-service secondary teachers and classification of quadrilaterals (Llinares, Fernández & Sánchez-Matamoros, 2016), the concept of derivative (Sánchez-Matamoros et al, 2015) and the concept of limit of a function (Fernández, Sánchez-Matamoros, Callejo & Moreno, 2015). Results allowed us to characterize degrees in the development of teaching competence.…”