The Great Debate topic for S4x14 was:
Are Risk Based Approaches Bound to Fail in Securing Critical Infrastructure ICS?
The idea for the topic was a Bound to Fail paper by Ralph Langner and Perry Pederson for the Brookings Institution. We had Jim Gilsinn of Kenexis and Marc Blackmeer of Cisco arguing that risk based approaches are helpful and necessary. Zach Tudor of SRI and Mike Ahmadi of Codenomicon making the case that risk based approaches are bound to fail.
After the four of them argue the issue for 25 minutes it is thrown out to the audience for the remaining 25 minutes. You will see the S4 attendees are not shy about giving their opinion and mixing it up.