My response would be that I oppose going from principles to choices and only then coming up with concrete questions. In my class, I've basically designed about 20 questions about the potential consequences of electoral systems. By the way, you're all invited anytime to come to my classes on Thursday morning. Just email me and I'll invite you and you'll see how students think about it.
You need to discuss the impact on the number of parties, on government duration, on links between MPs and citizens, on the representation of women, all of these specific questions, and then at the end you have to discuss values. But let's talk about the concrete consequences of electoral systems. That would be my argument.
I remind you as well that you're all invited to this public forum that was organized on October 20. There will be four political scientists, each one arguing for one system, who will present all the evidence in favour of these four different systems.