This book shows the scope of research over more than 20 years. The central problem addressed is the articulation between secondary and university levels and the issues of admission, student performance and adaptation to life at university. The multiple aspects of the object of study made it possible to initially focus the analysis on engineering students. Given the complexity of mathematics classroom management, it was necessary to extend the analysis, on the one hand, to potential students of these careers, i.e., those about to graduate from secondary school, and, on the other hand, to the mathematics and ICT training of secondary school teachers.