CISSMUN is a Model United Nations conference hosted by the prestigious Concordia International School in Shanghai each January. It is part of a constellation of Model UN conferences affiliated with The Hague International Model United Nations (THIMUN). 

PLC Sydney students participate in Model UN events from Year 9. CISSMUN represents the next level of competition with students working alongside students from around the world. 

Students in Years 10 and 11 have the opportunity to seek, through discussion, negotiation and debate, solutions to world problems. They are required to research and prepare topics for discussion and adopt views other than their own - challenging their understanding about world issues and providing deeper insight into causes of conflict. They learn about the United Nations organisation and its vital role in working towards a peaceful world.