This study explores the implementation of peer assessment with a group of students studying physics at Advanced level in a post-secondary school in Malta. The study that draws on action research methodology looks at how the views of students regarding peer assessment evolve as they engage with peer assessment. The research involved the actual implementation of an apprenticeship model of peer assessment and looked at the issues faced by the students. The results of the study show that students were very much immersed in a traditional assessment culture and needed to be trained to develop peer assessment skills. Student concerns related to fairness, regarding their abilities as assessors and dependence on the teacher as "expert" remained unchanged as the students engaged with peer assessment. Successful implementation of peer assessment therefore requires a re-examination of the role of student and teachers as assessors within a safe learning environment.