A study investigated peer collaboration among high school students when solving qualitative physics problems. Participants were 18 students in a year 12 physics class in a Hong Kong school, who worked both individually and in groups to solve physics problems. Findings revealed the positive impact of engaging students in peer collaboration to solve physics problems. Peer collaboration enhanced participants' understanding and problem-solving skills, encouraged them to reflect on the objects of learning and their approach to learning physics, and provided them with a new perspective on problem solving. Other findings of the study are discussed, and recommendations for future research are provided.[Copyright of International Journal of Science Education is the property of Routledge. Full article may be available at the publisher's website: http://dx.doi.org/10.1080/09500690110038602]