This is one reason you need to be careful about disqualifying people from the decision if you're relying on the large-crowd effect--for example, an educational

This is one reason you need to be careful about disqualifying people from the decision if you're relying on the large-crowd effect--for example, an educational requirement to vote or only letting certain engineers participate in planning poker type estimations. Unless you successfully boil it down to a small-crowd expert decision you'll spoil the process with skew. The uninformed people have a place in a larger-crowd process.