The ESTRO Board has always felt it as one of its priorities to promote the exchange of information between the different professional groups involved in research in the field of radiation oncology. With this in mind, a meeting has been designed, providing an opportunity for oncologists, physicists, biologists, and radiation technologists to present work in progress in a format in which stimulates discussion and collaboration. The previous CERRO meetings have been highly successful as they were built on a framework of short presentations with ample time for discussion, in an inter-disciplinary setting.