You could walk through a simple program/assignment that has a certain set of requirements. For this assignment, you could play the role of Business/QA and let the audience play the role of the Programmer(s) on the project. Throughout the activity, create a dialogue based on potential requirement changes and encourage them(group of devs) to collaborate with you (BA/QA) to come up with a viable solution.
I like that idea. thank you. Now I just have to come up with a project idea.
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