Funded by the Marie Skłodowska-Curie Actions programme, the ACO project aims to investigate the early history of our solar system. It will do so by comparing the chemical composition of today forming solar system-like planetary systems with that of primitive bodies in the solar system. The project will set up coordinated research projects that will be carried out by 17 early-stage researchers, who will have the opportunity to acquire a wide range of transferable skills, including the ability to communicate science to a broad audience. They will also be offered secondments and training from partners outside ACO.