Jane here. I worked with the staff of a fine arts magnet middle school in Tucson this week (Go Unicorns!) that was grappling with the difference between activity-based learning and project-based learning. Through discussion we came close to an operational definition of each, which could help them sort and improve their project ideas. They would like to be able to say, for example, "No, I think that's more of an activity, it's not really a project. A project would be/have..."