We report on a teaching project that involved the use of peer-supported group-work tutorials in a large (n = 414) service teaching module in Dublin City University in the academic year 2010-11. We describe the background and motivation for the project, and its design and execution. This includes a corresponding tutor training element. We report on feedback on the tutorials obtained from students and tutors, and discuss the students’ performance on the module assessments in the light of the group-work tutorials. We found little evidence of success in the project, and attempt to relate this to existing conceptual frameworks describing the effective implementation of group-work.