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University study is not just acquisition of knowledge. Quality of study are best expressed in students' acquired competences. In the last few years' students grade lecturers and courses for improving the quality of TLS (teaching-studying-learning) processes. Students have become accustomed to their rights but in general they forget or does not understand their obligations in the TLS processes. We have studied the understanding of the concept of quality in the students' work in their project assignments. Project based learning (PBL) is a didactical strategy where students gain or improve several competences from the key EU competence framework and prepares them to the real working environment. To acquire necessary data, we use students' seminar works and analyze their content from various aspects. The research shows that students in general do not understand the concept of quality. We have seen that systematical work is needed to educate them to internalize the concept of quality.