The broadest mission of these Conferences is collective pursuit of understanding of the issues surrounding early diagnosis and early treatment of lung cancer. Starting with the Early Lung Cancer Action Program (ELCAP), which evolved into the International (I)-ELCAP, the focus has always been on practice-relevant research. CT screening for lung cancer continues to be implemented throughout the world. Guidelines are increasingly being developed by many organizations. The focus of this conference is on the research needed for further development of policies by clinical (professional societies, medical institutions, insurance companies) and by public (government) entities to address the benefit of the screening and the concerns about the potential harms.