Anglès: Nowadays the European society is living a revolutionary change in their high education system with the coming into effect of the European space for higher education. This new space for higher education was set out in the Bologna declaration. The aim of this declaration is to structure the higher education in a convergent way in 47 countries. In Spain, the application of the Bologna declaration defines a completely opposite philosophy in higher education. The way the lecturers used to organize their degrees in Spain was based in a master class were the interaction between the teacher and their students was almost zero. The evaluation method was based in a final examination were the student had to answer the final exam and its final mark was hundred per cent based on its exam’s result. With the coming into effect of the European space for higher education, everybody’s role has changed. Now, the lecturers are expected not to dazzle their students with a master class but to direct their students’ efforts toward the topics they have not properly understood, mentoring their day by day work. The students are expected to work an amount of hours per week by themselves in different tasks and going into the topics. This new paradigm in the higher education applied to the schools of civil engineering and more specifically to the reinforced concrete area demands new educational tools to make easier for the students to work out the calculations. The key point of these tools is to let the students be focused in the different theoretical parts of the problem and at the same time to let them work out many different cases without having to repeat every time some calculations which are already assumed as known from previous courses. Therefore, they can see how the different parameters (Reinforced area, concrete cross section, etc.) change the final result by themselves, without their lecturers’ help. These tools must be focused on improving the learning performance in the important and most difficult topics. This dissertation’s target is to develop one of these tools to work out the reinforced and prestressed concrete interaction diagram for section subjected to axial load and biaxial bending moment, helping the students with a useful tool to work out one of the most common problems in reinforced beams