As we deal with a complex world, we make assumptions. This is an inbuilt function of our brain that helps us quickly make sense of the world around us. The problem with this is that sometimes these assumptions turn out to be wrong and misleading to the point that they can actually hinder our judgment.
An area where this is most prevalent is stereotyping. For example, you may see a homeless person. The straight forward assumption is that this person is poor and is poor as a result of making bad decisions in life. In reality, it could just be that he has experienced misfortune—a simple back luck that can happen to anyone at any time. Holding him responsible for this misfortune can be unfair.
The purpose of this exercise is to get the delegates to share information with each other on counter-examples and to see stereotyping with a new perspective.