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The panel had the goldfish bowl format and had as panelists the main experts in the field: Paul Clements, Charles W. Krueger, John McGregor, Dirk Muthig, and David Weiss.
The panel discussed issues as: How do you think a good product line architecture should look like? How much up-front design do we need for a product line architecture? What are hot research topics in product line architecture?
The mind-map summarizing the panel can be seen here. [thanks to Klaus Schmid].