Students in the Physiotherapy Programme carried out a group project in their final year of studies. The objectives of the project were that the students learn and appreciate the process and activities involved in research, acquire deeper understanding of a topic in their professional interest, learn to work as a team, manage their own time, collaborate with others and produce a meaningful report. In the case of group work, usually the written report is assessed and the same mark is given to all members. Sometimes the supervisors' and group members' assessment of the members' involvement and participation in the project, oral presentation or viva voce contributes a small portion to the final grade of each student. This practice is limited to the assessment of the outcome of the group effort and does not reflect the process of learning by individual members. Portfolio assessment of learning involves the students themselves reflecting on and evaluating their learning and also allows teachers to evaluate individual students' learning in group tasks. In this paper, the implementation of the portfolio assessment, the criteria for the assessment of the portfolios and the students' opinions on the portfolio assessment are discussed.[Copyright of Assessment & Evaluation in Higher Education is the property of Routledge. Full article may be available at the publisher's website: http://dx.doi.org/10.1080/02602930601116904]