The International Baccalaureate Diploma Programme for secondary education students requires the successful completion of the Creativity, Action, Service (CAS) component (more recently renamed Creativity, Activity, Service) which is based on the philosophy of experiential learning and Academic Service Learning. In this article, the technique of mixed content analysis is employed to examine the perceptions of students in an International Baccalaureate Greek private school regarding the implementation and effectiveness of CAS. The empirical results indicate that students perceive and conceptualise volunteering activities in two contrasting dimensions, namely idealistic-humanitarian and utilitarian-instrumentalist, implying that Academic Service Learning projects may need to be adjusted to achieve their objectives.