The National Guidelines for teaching Philosophy specify the skills that students must develop by the end of the upper secondary school. This article presents the learning unit "Ethics and Responsibility in Twentieth Century Philosophy", designed for final-year students. This learning unit is aimed at consolidating the skills called for in the National Guidelines. In order to achieve such aim, it is developed through the interweaving of different approaches to the study of philosophy, and by alternating different methods of working with the students.