ANÁLISIS Y CLASIFICACIÓN DE ERRORES COMETIDOS POR ALUMNOS DE SECUNDARIA EN LOS PROCESOS DE SUSTITUCIÓN FORMAL, GENERALIZACIÓN Y MODELIZACIÓN EN ÁLGEBRA.

We present a study with secondary students about three specific processes of algebraic language: Formal substitution, generalization, and modelling. Using a test, we develop a students' errors classifications, and we analyze its possible origins. Finally we present some didactical conclusions from the results. [ABSTRACT FROM AUTHOR]