Common Ground for Action (CGA) is an online tool to support deliberation among students in a single classroom and among students in different classroom communities. It can be used to engage students with contemporary public issues, historical decisions or other academic content while teaching the skills of careful listening. perspective-taking and weighing different options. Deliberation, the practice at the heart of CGA, has been used successfully used in K-12 social studies, communication arts and science classrooms across the US and around the world.