This research presents the results of a case study that analyses the Solidarity Atocha project, which was implemented at a school in Madrid, Spain, and in which 114 first-year High school students participated. The main objective of this study is to analyse the experience of students that participated in the Solidarity Atocha project and to understand how they evaluated it and how satisfied they were with it. The method applied in this case study is a mixed one that used both qualitative and quantitative techniques. A semantic differential and a semi-structured interview were used to collect data. In general, the results obtained reveal a very positive evaluation from the students, mainly in terms of teamwork and the use of digital tools. However, they encountered some difficulties with regard to the time spent on the project and to guidance provided as they worked on it. Inferential analyses show significant differences between the team groups.