Helpful exercise, but found the group debate/decision making process is better if people have longer to rank the jobs in the first place and are then asked to give some thoughts to why they ranked the jobs as they did.
I have even experimented with doing the exercises the other way around and briefing one member of the group to have a ‘secret’ hidden agenda in one group. The debrief discussion afterwards then enabled me to ask questions about which group were more successful (usually the one where people were all being honest).
All in all a neat little exercise that the majority of people could find an opinion about.