Be a scrum master/product owner for a demo product and have your students be part of the scrum team. You go over the product backlog and discuss the new features that you want to implement. Let the students figure out what can be done and why in a sprint cycle. The time allocation could be part of the exercise. Maybe someone estimates 2 days, another 5 days, which could open up discussion about why and where their head's at. Let them break things down bit by bit.
Thanks, i hadn't thought of introducing the notion of sprints, but that's a good idea.
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