Since 1999 Italian preservice teachers, after their degree, may attend a university course named SILSIS (scuola interuniversitaria per l’insegnamento secondario). In Pavia University future science teachers attend courses about pedagogy (Area 1) and about the teaching of scientific subjects (Area 2). They attend also practical teaching laboratories (Area 3) and they train in different schools (Area 4) to practice as teachers. Concept maps are useful tools for them: a) to determine “structural" concepts of the subject they are going to teach in their training in secondary schools, b) to detect students’ misconceptions, c) to draw a route of their "teaching-learning itineraries".