The project-based learning is a method for imparting students and pupils thinking competencies. First reference about project-based learning comes from the beginning of 20th century. Project-based learning is described by many definitions. Every of these definitions contain solution of a problem by the group of students. By this method is different role of teacher in comparison with traditional teaching. Teacher must be very good facilitator for the successful implementation this method to the curriculum. During the seminars from Didactics of biology students had got an opportunity to try this kind of method by the using obseravtion method of research. There were three groups of students, which presented three projects, where the main subject was biology. On the basis of presentation and analysis of the observation there were determined some imperfections, which had got presented in the students projects.